pidgin/pidgin

Merge release-2.x.y branch into main, with manual merges in
ChangeLog (easy)
Makefile.mingw (easy)
configure.ac (easy)
irc/msgs.c (not too bad)

And some Windows build files. We should make sure the pango used by 3.0.0
doesn't have the crash bug from CVE-2013-6486.
[Desktop Entry]
_Name=Pidgin Internet Messenger
_GenericName=Internet Messenger
_Comment=Chat over IM. Supports AIM, Google Talk, Jabber/XMPP, MSN, Yahoo and more
Exec=pidgin
Icon=pidgin
StartupNotify=true
Terminal=false
Type=Application
Categories=Network;InstantMessaging;
@USES_MM_CHAT_SECTION@