Use lower case style for commands

Where possible this syncs the CS for command names:

- check_c_source_compiles()
- check_cxx_compiler_flag()
- check_cxx_source_compiles()
- check_cxx_symbol_exists()
- check_include_file_cxx()
- check_include_file()
- check_include_files()
- check_library_exists()
- check_source_compiles()
- check_struct_has_member()
- check_symbol_exists()
- check_type_size()
- cmake_dependent_option()
- cmake_parse_arguments()
- feature_summary()
- file()
- find_package_handle_standard_args()
- if(), endif...
- install(FILES)
- list()
- message()
- pkg_check_modules()
- select_library_configurations()
- set_package_info()
- test_big_endian()

Modules/FindCUDA/select_compute_arch.cmake

@@ -12,7 +12,7 @@
 #      Additionally, sets ${out_variable}_readable to the resulting numeric list
 #      Example:
 #       CUDA_SELECT_NVCC_ARCH_FLAGS(ARCH_FLAGS 3.0 3.5+PTX 5.2(5.0) Maxwell)
-#        LIST(APPEND CUDA_NVCC_FLAGS ${ARCH_FLAGS})
+#        list(APPEND CUDA_NVCC_FLAGS ${ARCH_FLAGS})
 #
 #      More info on CUDA architectures: https://en.wikipedia.org/wiki/CUDA
 #