Allow to skip cointoss and select winner manually

[rzeczkowskip]

Right now we are limited by cointoss when it comes to selecting player that bans first. That's fine in case of "let's just play" situations, but when there's a tournament with proper seeding, rules might force the player that should ban first etc.

The idea is to add another select field, below "best of" with label Manual cointoss winner and values:

1. None
2. You
3. Opponent

Tell me if You're interested in PR or would change something. I'll be more than happy to contribute :)

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Just checked, Quake Challenger rules force that:

*** Map Ban and Pick Process: ***

1. High Seed - High Seed picks first map ban or defer
2. Player 1 - Ban Map 1
3. Player 2 - Ban Map 2
4. Player 1 - Pick Map 1
5. Player 2 - Pick Map 2
6. Player 1 - Ban Map 3
7. Player 2 - Ban Map 4

*** Champion Ban and Pick Process: ***
8. Player 1 - Ban Champion 1
9. Player 2 - Pick Champion Map 1
10. Player 1 - Pick Champion Map 1
11. Player 2 - Ban Champion 2
12. Player 1 - Pick Champion Map 2
13. Player 2 - Pick Champion Map 2
14. Player 1 - Ban Champion 3
15. Player 2 - Pick Champion Map 3
16. Player 1 - Pick Champion Map 3

[CameronCT]

I have implemented this request, which can be found here: e23a815...eb923ee