file isExecutable
Add a bunch of shortcodes to make life easier.

These will need to be abstracted a bit to handle other stuff like libgnt,
gplugin, talkatu, etc, but this is way easier to deal with than it was.

Testing Done:
Ran locally and verified all of the Sourceforge links are working.

Reviewed at
#!/bin/sh -e
hugo server -s hugo -D --disableFastRender -v --verboseLog --noHTTPCache --i18n-warnings