Add MindGame mode

[iMarv]

Add special gamemode:

Match is best of 3
Game 1: First to reach 10 points wins
Game 2: First to reach 20 points wins
Game 3: First to reach 30 points wins

Between games the score is not reset or swapped, teams still have to change sides. Example match:

Game 1:
Team A: 10
Team B: 5

Team A won first game in Bo3.
Now both teams switch sides and play to 20, so score is now:
Team A: 5
Team B: 10

Now Team B wins:
Team A: 5
Team B: 20

Team B wins game in Bo3.
Bo3 is now 1:1 so one more game will be played. The winner needs a score of 30.
Both teams switch sides again, so the score for the start of the last game will be

Team A: 20
Team B: 5

Team B has to score 25 times and Team A has to score 10 times.

If anything is unclear, consult me in person.