pidgin/pidgin

Implement a parser for ircv3 and add unit tests to it.

20 months ago, Gary Kramlich
170078e728c0
Implement a parser for ircv3 and add unit tests to it.

This change got pretty big so I didn't implement unescapping tags yet. I did
however put the unit tests in for escaped tags, but they are currently #if 0'd
out.

The unit tests are based on the msg-split test cases from https://github.com/ircdocs/parser-tests/blob/master/tests/msg-split.yaml

Testing Done:
Ran the unit tests.

Bugs closed: PIDGIN-17585

Reviewed at https://reviews.imfreedom.org/r/1874/
[Desktop Entry]
Name=Pidgin
GenericName=Internet Messenger
Comment=Chat over IM. Supports 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/gg;x-scheme-handler/irc;x-scheme-handler/sip;x-scheme-handler/xmpp;
@USES_MM_CHAT_SECTION@