pidgin/pidgin

66d473190e94
Start adding capability support to the IRCv3 protocol

Right now, this just requests the list of capabilities and stores it. In the
future we'll add hooks to allow the protocol and plugins to request additional
capabilities.

Testing Done:
Connected to a local ergo and verified that the capabilties were output to the terminal.

Reviewed at https://reviews.imfreedom.org/r/1915/
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