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.
For information on writing a plugin for Purple, Pidgin or Finch, go
https://developer.pidgin.im and click on API. From there, see the
HOWTOs in the "Related Pages" section.
You can also generate this documentation locally by installing
doxygen and graphviz dot, then running "make docs" in the
source tree. The documentation will be in the docs/html directory.