CardMelee 4.5 update : New cards for Teams mode !

4 new cards and some improvements.

- 2 new cards for Teams mode : Standard-bearer and Healer!
- 2 new cards featuring Firering for both FFA en Teams modes : More Firering and Allied bot (Firering)!
- Cards giving more ammo of one type, like More Nucleus, have less chance to appears if the corresponding weapon is not available in draft this round.
- Fix Powershot bug when a player has several Powershot cards.
- Other minimal improvements.