doc: Remove in source documentation and the asciidoc package

The RSB documentation is now in ReST format and part of the RTEMS
Documentation project. See https://docs.rtems.org/.

Remove support for the GPL based asciidoc tool and remove the
asciidoc package from the RSB.

Add the Python Markdown package and update the reporter to use
Markdown for HTML generation. The resuling HTML report is a single
self contained file.

Closes #3047.

source-builder/sb/markdown/extensions/smart_strong.py

@@ -0,0 +1,41 @@
+'''
+Smart_Strong Extension for Python-Markdown
+==========================================
+
+This extention adds smarter handling of double underscores within words.
+
+See <https://pythonhosted.org/Markdown/extensions/smart_strong.html>
+for documentation.
+
+Original code Copyright 2011 [Waylan Limberg](http://achinghead.com)
+
+All changes Copyright 2011-2014 The Python Markdown Project
+
+License: [BSD](http://www.opensource.org/licenses/bsd-license.php)
+
+'''
+
+from __future__ import absolute_import
+from __future__ import unicode_literals
+from . import Extension
+from ..inlinepatterns import SimpleTagPattern
+
+SMART_STRONG_RE = r'(?<!\w)(_{2})(?!_)(.+?)(?<!_)\2(?!\w)'
+STRONG_RE = r'(\*{2})(.+?)\2'
+
+
+class SmartEmphasisExtension(Extension):
+    """ Add smart_emphasis extension to Markdown class."""
+
+    def extendMarkdown(self, md, md_globals):
+        """ Modify inline patterns. """
+        md.inlinePatterns['strong'] = SimpleTagPattern(STRONG_RE, 'strong')
+        md.inlinePatterns.add(
+            'strong2',
+            SimpleTagPattern(SMART_STRONG_RE, 'strong'),
+            '>emphasis2'
+        )
+
+
+def makeExtension(*args, **kwargs):
+    return SmartEmphasisExtension(*args, **kwargs)