Extract pidgin_presence_get_icon_name from PidginPresenceIcon so others can use it.
Extract `pidgin_presence_get_icon_name` from PidginPresenceIcon so others can use it.
Testing Done:
Compiled, `pidgin-pot`, `pidgin-doc`, and joined an XMPP MUC as well as Bonjour IM.
Reviewed at https://reviews.imfreedom.org/r/278/