pidgin/pidgin

Modernizing PurpleChatConversation.

2021-04-05, Gary Kramlich
73407e00ec5d
Modernizing PurpleChatConversation.

I wasn't able to do everything as PurpleConversation still isn't declared with
G_DECLARE_DERIVABLE_TYPE.

Testing Done:
Compiled ran locally with both xmpp mucs and irc channels.

Reviewed at https://reviews.imfreedom.org/r/583/
subdir('libpurple')
subdir('protocols')
if ENABLE_GTK
subdir('pidgin')
else
pidgin_doc = []
endif
if enable_consoleui
subdir('finch')
else
finch_doc = []
endif
alias_target('doc', libpurple_doc, protocols_doc, pidgin_doc, finch_doc)