Add AI players

[Blaarkies]

When creating a new match, add option for AI players
AI players have different skill levels

• Test out various combinations of aim and power (20° increments, 5% increments)
• Use the trajectory simulations to determine impact location of warhead
  • Limit trajectories to warhead flight-time/distance to tune bot's skill level
• If impact engulfs an enemy vehicle, use those settings and fire a shot
• Pick shields based on simple rules
• Make AI players pick shots/shields quickly, but visible to human players
  • Mock the aiming sequence for human eyes to keep up with
  • Indicate shield/weapon selection
  • Show current stats, just like you would see over the should while a human player is aiming
• Investigate a grudge system, AI bots keeps a list of who destroyed them in previous rounds, and uses this to target them as first targets in the next round

[Blaarkies]

Dependent on #20

• Use shot prediction to check AI aim