Add tdemarkdown part - embeddable lightweight markdown viewing component.

TDEMarkdown is based on the md4c library and using TDEHTML for rendering
its output. For enhanced safety, on HTML widget is turned off everything
we don't need for viewing. It integrates nicely into Konqueror and
supports both Commonmark and GitHub markdown syntaxes.

Signed-off-by: Mavridis Philippe <mavridisf@gmail.com>

Prepare to merge tdemarkdown into tdelibs.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

1 files changed, 99 insertions, 0 deletions

diff --git a/tdemarkdown/md4c/test/permissive-url-autolinks.txt b/tdemarkdown/md4c/test/permissive-url-autolinks.txt
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+
+# Permissive URL Autolinks
+
+With the flag `MD_FLAG_PERMISSIVEURLAUTOLINKS`, MD4C enables more permissive recognition
+of URLs and transform them to autolinks, even if they do not exactly follow the syntax
+of autolink as specified in CommonMark specification.
+
+This is a standard CommonMark autolink:
+
+```````````````````````````````` example
+Homepage: <https://github.com/mity/md4c>
+.
+<p>Homepage: <a href="https://github.com/mity/md4c">https://github.com/mity/md4c</a></p>
+````````````````````````````````
+
+With the permissive autolinks enabled, this is sufficient:
+
+```````````````````````````````` example
+Homepage: https://github.com/mity/md4c
+.
+<p>Homepage: <a href="https://github.com/mity/md4c">https://github.com/mity/md4c</a></p>
+````````````````````````````````
+
+But this permissive autolink feature can work only for very widely used URL
+schemes, in alphabetical order `ftp:`, `http:`, `https:`.
+
+That's why this is not a permissive autolink:
+
+```````````````````````````````` example
+ssh://root@example.com
+.
+<p>ssh://root@example.com</p>
+````````````````````````````````
+
+The same rules for path validation as for permissivve WWW autolinks apply.
+Therefore the final question mark here is not part of the autolink:
+
+```````````````````````````````` example
+Have you ever visited http://www.zombo.com?
+.
+<p>Have you ever visited <a href="http://www.zombo.com">http://www.zombo.com</a>?</p>
+````````````````````````````````
+
+But in contrast, in this example it is:
+
+```````````````````````````````` example
+http://www.bing.com/search?q=md4c
+.
+<p><a href="http://www.bing.com/search?q=md4c">http://www.bing.com/search?q=md4c</a></p>
+````````````````````````````````
+
+And finally one complex example:
+
+```````````````````````````````` example
+http://commonmark.org
+
+(Visit https://encrypted.google.com/search?q=Markup+(business))
+
+Anonymous FTP is available at ftp://foo.bar.baz.
+.
+<p><a href="http://commonmark.org">http://commonmark.org</a></p>
+<p>(Visit <a href="https://encrypted.google.com/search?q=Markup+(business)">https://encrypted.google.com/search?q=Markup+(business)</a>)</p>
+<p>Anonymous FTP is available at <a href="ftp://foo.bar.baz">ftp://foo.bar.baz</a>.</p>
+````````````````````````````````
+
+
+## GitHub Issues
+
+### [Issue 53](https://github.com/mity/md4c/issues/53)
+
+```````````````````````````````` example
+This is [link](http://github.com/).
+.
+<p>This is <a href="http://github.com/">link</a>.</p>
+````````````````````````````````
+
+```````````````````````````````` example
+This is [link](http://github.com/)X
+.
+<p>This is <a href="http://github.com/">link</a>X</p>
+````````````````````````````````
+
+
+## [Issue 76](https://github.com/mity/md4c/issues/76)
+
+```````````````````````````````` example
+*(http://example.com)*
+.
+<p><em>(<a href="http://example.com">http://example.com</a>)</em></p>
+````````````````````````````````
+
+
+## [Issue 152](https://github.com/mity/md4c/issues/152)
+
+```````````````````````````````` example
+[http://example.com](http://example.com)
+.
+<p><a href="http://example.com">http://example.com</a></p>
+````````````````````````````````