This add profanity and dependencies and a few cleanups from me for the
profanity package expression.
Thanks to @devhell and apologies for pestering him with my nitpicking.
* Commit summary:
profanity: Add option for autoAwaySupport.
profanity: Clean up package expression file.
profanity: Add libnotifySupport config option
all-packages: Add libnotify option to profanity
profanity: Add "platforms" meta information
profanity: Add libXScrnSaver and libX11 buildInputs
libstrophe: Add "platforms" meta information
libstrophe: Fix typo
profanity: Add profanity, a ncurses XMPP client
libstrophe: Add new package