Create Basic Enemy Defeat Process

[eric62369]

For boss enemy:

• [ ] When HP reaches 0, send defeat event
• [ ] New DefeatController
• [ ] When Enemy becomes grounded, launch enemy high into the air (still hittable)
• [ ] (Send out some dustcloud trails)
• [ ] After set time of no hits, delete enemy and spawn defeat effect
• [ ] Handle making an offscreen boss enemy, or default facing direction, etc.