pidgin/nest

c3b3dcf494c8
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 https://reviews.imfreedom.org/r/557/
Alan Hoskins <alanhoskins@gmail.com>
Elliott Sales de Andrade <quantum.analyst@gmail.com>
Frederick F. Kautz IV <fkautz@alumni.cmu.edu>
Gary Kramlich <grim@reaperworld.com>
Harrison <harrisonhopkins@gmail.com>
Jason Allan <code@jasonderrythomas.com>
John Bailey <rekkanoryo@rekkanoryo.org>
Richard Laager <rlaager@wiktel.com>
Robert Vehse <robertvehse@fastmail.fm>
Sorvival <sorvival@tutanota.com>
Zero <programmingzero@gmail.com>