VS: Update v142 CL flag table for VS 16.10

Run the command

    python3 Source/cmConvertMSBuildXMLToJSON.py -t v142 \
        'c:/.../MSBuild/Microsoft/VC/v160/1033/cl.xml'

To generate `v142_CL.json` locally.  Manually move new and updated
settings over to `Templates/MSBuild/FlagTables/v142_CL.json`.

Revise the `/sourceDependencies[:directives]` table entries to properly
distinguish the two options (because one is a prefix of the other), and
to populate both `Generate*Dependencies` and `*DependenciesFile`.

Templates/MSBuild/FlagTables/v142_CL.json

@@ -384,6 +384,13 @@
     "value": "AdvancedVectorExtensions2",
     "flags": []
   },
+  {
+    "name": "EnableEnhancedInstructionSet",
+    "switch": "arch:AVX512",
+    "comment": "Advanced Vector Extensions 512",
+    "value": "AdvancedVectorExtensions512",
+    "flags": []
+  },
   {
     "name": "EnableEnhancedInstructionSet",
     "switch": "arch:IA32",
@@ -419,31 +426,45 @@
     "value": "Fast",
     "flags": []
   },
+  {
+    "name": "SpectreMitigation",
+    "switch": "Qspectre-load-cf",
+    "comment": "All Control Flow Loads",
+    "value": "SpectreLoadCF",
+    "flags": []
+  },
+  {
+    "name": "SpectreMitigation",
+    "switch": "Qspectre-load",
+    "comment": "All Loads",
+    "value": "SpectreLoad",
+    "flags": []
+  },
   {
     "name": "SpectreMitigation",
     "switch": "Qspectre-",
-    "comment": "Spectre mitigations disabled",
+    "comment": "Disabled",
     "value": "false",
     "flags": []
   },
   {
     "name": "SpectreMitigation",
     "switch": "Qspectre",
-    "comment": "Spectre mitigations enabled",
+    "comment": "Enabled",
     "value": "Spectre",
     "flags": []
   },
   {
     "name": "ConformanceMode",
     "switch": "permissive-",
-    "comment": "Conformance mode enabled",
+    "comment": "Yes",
     "value": "true",
     "flags": []
   },
   {
     "name": "ConformanceMode",
     "switch": "permissive",
-    "comment": "Conformance mode disabled",
+    "comment": "No",
     "value": "false",
     "flags": []
   },
@@ -630,6 +651,27 @@
     "value": "CompileAsCpp",
     "flags": []
   },
+  {
+    "name": "CompileAs",
+    "switch": "interface",
+    "comment": "Compile as C++ Module Code",
+    "value": "CompileAsCppModule",
+    "flags": []
+  },
+  {
+    "name": "CompileAs",
+    "switch": "internalPartition",
+    "comment": "Compile as C++ Module Internal Partition",
+    "value": "CompileAsCppModuleInternalPartition",
+    "flags": []
+  },
+  {
+    "name": "CompileAs",
+    "switch": "exportHeader",
+    "comment": "Compile as C++ Header Unit",
+    "value": "CompileAsHeaderUnit",
+    "flags": []
+  },
   {
     "name": "ErrorReporting",
     "switch": "errorReport:none",
@@ -732,6 +774,13 @@
       "Continue"
     ]
   },
+  {
+    "name": "ForceSynchronousPDBWrites",
+    "switch": "FS",
+    "comment": "Force Synchronous PDB Writes",
+    "value": "true",
+    "flags": []
+  },
   {
     "name": "IntrinsicFunctions",
     "switch": "Oi",
@@ -802,6 +851,20 @@
     "value": "true",
     "flags": []
   },
+  {
+    "name": "UseStandardPreprocessor",
+    "switch": "Zc:preprocessor-",
+    "comment": "Use Standard Conforming Preprocessor",
+    "value": "false",
+    "flags": []
+  },
+  {
+    "name": "UseStandardPreprocessor",
+    "switch": "Zc:preprocessor",
+    "comment": "Use Standard Conforming Preprocessor",
+    "value": "true",
+    "flags": []
+  },
   {
     "name": "StringPooling",
     "switch": "GF-",
@@ -886,6 +949,41 @@
     "value": "true",
     "flags": []
   },
+  {
+    "name": "IntelJCCErratum",
+    "switch": "QIntel-jcc-erratum",
+    "comment": "Enable Intel JCC Erratum Mitigation",
+    "value": "true",
+    "flags": []
+  },
+  {
+    "name": "GuardEHContMetadata",
+    "switch": "guard:ehcont-",
+    "comment": "Enable EH Continuation Metadata",
+    "value": "false",
+    "flags": []
+  },
+  {
+    "name": "GuardEHContMetadata",
+    "switch": "guard:ehcont",
+    "comment": "Enable EH Continuation Metadata",
+    "value": "true",
+    "flags": []
+  },
+  {
+    "name": "GuardSignedReturns",
+    "switch": "guard:signret-",
+    "comment": "Enable Signed Returns",
+    "value": "false",
+    "flags": []
+  },
+  {
+    "name": "GuardSignedReturns",
+    "switch": "guard:signret",
+    "comment": "Enable Signed Returns",
+    "value": "true",
+    "flags": []
+  },
   {
     "name": "DisableLanguageExtensions",
     "switch": "Za",
@@ -980,7 +1078,7 @@
   {
     "name": "EnableModules",
     "switch": "experimental:module",
-    "comment": "Enable C++ Modules (experimental)",
+    "comment": "Enable Experimental C++ Standard Library Modules",
     "value": "true",
     "flags": []
   },
@@ -998,6 +1096,15 @@
     "value": "true",
     "flags": []
   },
+  {
+    "name": "GenerateModuleDependencies",
+    "switch": "sourceDependencies:directives",
+    "comment": "Generate Module Dependenices File",
+    "value": "true",
+    "flags": [
+      "Continue"
+    ]
+  },
   {
     "name": "GenerateXMLDocumentationFiles",
     "switch": "doc",
@@ -1009,6 +1116,15 @@
       "Continue"
     ]
   },
+  {
+    "name": "GenerateSourceDependencies",
+    "switch": "sourceDependencies",
+    "comment": "Generate Source Dependencies File",
+    "value": "true",
+    "flags": [
+      "Continue"
+    ]
+  },
   {
     "name": "BrowseInformation",
     "switch": "FR",
@@ -1020,6 +1136,27 @@
       "Continue"
     ]
   },
+  {
+    "name": "TreatAngleIncludeAsExternal",
+    "switch": "external:anglebrackets",
+    "comment": "Treat Files Included with Angle Brackets as External",
+    "value": "true",
+    "flags": []
+  },
+  {
+    "name": "ExternalTemplatesDiagnostics",
+    "switch": "external:templates-",
+    "comment": "Template Diagnostics in External Headers",
+    "value": "true",
+    "flags": []
+  },
+  {
+    "name": "DisableAnalyzeExternal",
+    "switch": "analyze:external-",
+    "comment": "Disable Code Analysis for External Headers",
+    "value": "true",
+    "flags": []
+  },
   {
     "name": "ShowIncludes",
     "switch": "showIncludes",
@@ -1075,6 +1212,36 @@
       "SemicolonAppendable"
     ]
   },
+  {
+    "name": "AdditionalBMIDirectories",
+    "switch": "ifcSearchDir",
+    "comment": "Additional BMI Directories",
+    "value": "",
+    "flags": [
+      "UserValue",
+      "SemicolonAppendable"
+    ]
+  },
+  {
+    "name": "AdditionalModuleDependencies",
+    "switch": "reference",
+    "comment": "Additional Module Dependencies",
+    "value": "",
+    "flags": [
+      "UserValue",
+      "SemicolonAppendable"
+    ]
+  },
+  {
+    "name": "AdditionalHeaderUnitDependencies",
+    "switch": "headerUnit",
+    "comment": "Additional Header Unit Dependencies",
+    "value": "",
+    "flags": [
+      "UserValue",
+      "SemicolonAppendable"
+    ]
+  },
   {
     "name": "PreprocessorDefinitions",
     "switch": "D",
@@ -1095,6 +1262,26 @@
       "SemicolonAppendable"
     ]
   },
+  {
+    "name": "StdIfcDirectory",
+    "switch": "stdIfcDir",
+    "comment": "",
+    "value": "",
+    "flags": [
+      "UserValue",
+      "SemicolonAppendable"
+    ]
+  },
+  {
+    "name": "ExternalDirectoriesEnv",
+    "switch": "external:env:",
+    "comment": "External Directories Environment Variables",
+    "value": "",
+    "flags": [
+      "UserValue",
+      "SemicolonAppendable"
+    ]
+  },
   {
     "name": "DisableSpecificWarnings",
     "switch": "wd",
@@ -1210,6 +1397,24 @@
       "UserValue"
     ]
   },
+  {
+    "name": "ModuleOutputFile",
+    "switch": "ifcOutput",
+    "comment": "Module Output File Name",
+    "value": "",
+    "flags": [
+      "UserValue"
+    ]
+  },
+  {
+    "name": "ModuleDependenciesFile",
+    "switch": "sourceDependencies:directives",
+    "comment": "Module Dependencies File Name",
+    "value": "",
+    "flags": [
+      "UserFollowing"
+    ]
+  },
   {
     "name": "ObjectFileName",
     "switch": "Fo",
@@ -1238,6 +1443,15 @@
       "UserRequired"
     ]
   },
+  {
+    "name": "SourceDependenciesFile",
+    "switch": "sourceDependencies",
+    "comment": "Source Dependencies File Name",
+    "value": "",
+    "flags": [
+      "UserFollowing"
+    ]
+  },
   {
     "name": "BrowseInformationFile",
     "switch": "FR",