Implement debriefing message

[Licho1]

Server sends BattleDebriefing now, request more data if needed.

It could be sort of floating dialog with mini chat and results.

Atm it sends awards, elo, xp changes, whether new level happened etc.

See https://github.com/ZeroK-RTS/Zero-K-Infrastructure/blob/master/Shared/LobbyClient/Protocol/Messages.cs#L541
for reference

Debriefing channel happens only for MM battles atm.

[Licho1]

I think it would benice to have progressbar to next level etc. usual grinding stuff?