Emojify reactions

[n-peugnet]

I don't know how Matrix reactions really work, but I suppose that to send emoji reactions, we just have to put its unicode tag in the content of the reaction. As #65 has been merged, I guess we could reuse the emoji.Sprint(text) function for this task. I looked a little bit at the code and identified some functions where to put It, but I don't really know which one would be the best:

gomuks/ui/commands.go

Line 194 in db108d4

func cmdReact(cmd *Command) {

gomuks/ui/room-view.go

Line 680 in db108d4

func (view *RoomView) SendReaction(eventID id.EventID, reaction string) {

I am not really used to go and I do not manage to make the app built from source work correctly alongside the packaged one, so I would prefer not to make the change myself.

[tulir]

You can already just autocomplete emojis, but if someone wants to make a PR that makes /react optionally (either the existing disable_emojis option or a new one) use emoji.Sprint, I'd probably accept it.

[n-peugnet]

I didn't know it was possible 😆 ! I just tried to hit tab and it worked as expected. I will add it to the wiki.

[tulir]

This was added in #354