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/
/* pidgin
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char*msg=g_strdup_printf(ngettext("You have %d contact named %s. Would you like to merge them?","You currently have %d contacts named %s. Would you like to merge them?",i),i,alias);
purple_request_action(NULL,NULL,msg,_("Merging these contacts will cause them to share a single entry on the buddy list and use a single conversation window. "
"You can separate them again by choosing 'Expand' from the contact's context menu"),0,NULL,