Limit ammo and shot speed

[ogallagher]

Spamming unlimited shots throughout the round needs to be prevented, and shot count and speed limits can help with this.

[ogallagher]

Added ammo, clip_capacity, and clip_recharge_speed instance variables to the Player class to limit shot count and firing rate.

• ammo_capacity= total shots per match
• clip_capacity = total ammo is divided into clips to limit shot rate
• clip_recharge_speed = proportion of clip recharged in one frame

[ogallagher]

I also added a shot indicator, whose length = clip * (this.ammo/this.ammo_capacity) * shot_indicator_length. The clip recharges at clip_recharge_speed every frame.