Make zirc IRCv3-compliant

[itslukej]

IRCv3 Specifications

IRCv3.1

Base Extensions

• [x] Capability Negotiation 3f3831cbd2d0bfd1850af792addee68c0fcd951d
• [ ] multi-prefix Extension
• [x] sasl Extension

Optional Extensions

• [ ] account-notify Extension
• [ ] away-notify Extension
• [ ] extended-join Extension
• [x] tls Extension Probably impossible due to the nature of how the SSL socket works

IRCv3.2

Base Extensions

• [x] Capability Negotiation
• [x] Message Tags #22
• [x] metadata Extension Deprecated
• [ ] monitor Extension

Optional Extensions

• [x] account-tag Extension - Supported with message tags, nothing needs to be done here
• [ ] batch Extension
• [x] cap-notify Extension
• [ ] chghost Extension
• [ ] echo-message Extension
• [ ] invite-notify Extension
• [x] sasl Extension
• [x] server-time Extension - Supported with message tags, nothing needs to be done here
• [ ] userhost-in-names Extension

[wolfy1339]

After this is all done, we could get zIRC listed on the IRCv3 website