pidgin/pidgin

Split PurpleProtocolChat to its own file and clean up the API.

2021-01-11, Gary Kramlich
81f81f5d2f39
Split PurpleProtocolChat to its own file and clean up the API.

Testing Done:
* Compiled and tested bonjour (not affected) and irc locally.
* Built and verified the docs.
* verified `ninja pidgin-pot` was successful.

Bugs closed: 17457

Reviewed at https://reviews.imfreedom.org/r/406/
[Desktop Entry]
Name=Pidgin
GenericName=Internet Messenger
Comment=Chat over IM. Supports AIM, Google Talk, Jabber/XMPP, and more
Exec=purple3-url-handler %u
TryExec=purple3-url-handler
Icon=pidgin
StartupNotify=false
Terminal=false
NoDisplay=true
Type=Application
Categories=Network;InstantMessaging;RemoteAccess;ConsoleOnly;
MimeType=x-scheme-handler/aim;x-scheme-handler/gg;x-scheme-handler/icq;x-scheme-handler/irc;x-scheme-handler/msnim;x-scheme-handler/sip;x-scheme-handler/xmpp;x-scheme-handler/ymsgr
@USES_MM_CHAT_SECTION@