xmpp: Remove unused prototypes and code
Review Request #1905 — Created Oct. 7, 2022 and submitted — Latest diff uploaded
Many functions are 'public' in that they are in header files, but they don't need to be. The
jabber.cones were likely there because of the xmpp/gtalk multi-library thing that's gone now.
This removal is 'naive', in that if a prototype is necessary for now-
staticfunctions, then that's all I did, instead of any re-ordering.
I also left in some 'unused'
data.cfunctions as their use was deleted when removing smileys and they may still be needed.