Ability to configure networks via IRC without immediately connecting to it

[jlu5]

This can be useful for networks that require SASL or some specific settings to be configured before connecting.

I can imagine this being added as a --not-now option to @connect or something similarly named.

(I'm filing this issue per a discussion with @TheMythPT)

[progval]

Or add a new @add method to the Network plugin

[TehPeGaSuS]

That would bem pretty neat too. That way it would spare us to disconnect the bot, change the corresponding settings of the network and reconnect.