Support 2v2 and 3v3 battles in arena

[leordev]

With the new release we will be able to do multipets battles!

The turns will work 2 or 3 pets attacking the enemies at the same time...

3v3 battle example

turn 1:

• pet 1 team A attacks pet 4 team B
• pet 2 team A attacks pet 4 team B
• pet 3 team A attacks pet 6 team B

turn 2:

• pet 4 team B attacks pet 3 team A
• pet 5 team B attacks pet 3 team A
• pet 6 team B attacks pet 3 team A

[leordev]

just as a fyi I will probably finish this in the contract this weekend