Genericize cap parsing and negotiation #79
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Expand cap parsing to allow for caps with a value, and add an option to specify
more capabilities to negotiate with the server.
Fixes #78
I'm making this a WIP for now for a couple reasons:
Client.opt.sasl
entirely to force things to adopt the new way of passing aSet
of caps toClient
. I could do a deprecation thing where the constructor adds opt.sasl to opt.capabilities, but since the only thing using this is matrix-appservice-irc I don't think there's a need to postpone the removal. However if that's something you want, I can add it in.