Add support for emote modifiers

[ReggX]

BTTV and FFZ have emote modifiers now.

For BTTV, adding w! v! or h! before an emote modifes it size/orientation, and z! enforces zero spacing between emotes.

For FFZ, paid subscribers can write modifiers after the emote to add an effect: https://www.frankerfacez.com/subscribe

They are currently unsupported in jChat and just appear as text.