TODO:

• fix bug when tanks collide infinitely and stuck
• fix bots spawn position
• bullets collision with tanks
• different bot types (armored, personnel carrier etc)
• improve AI (better pathfinding to HQ)
• bonuses
• block and tank destruction animations
• HQ drawing
• full game circle (main menu, stages loading, playground, score board, game over)
• sound effects
• ice/trees stage blocks
• tank creation animation
• all stages (4/35 done)
• player two