HW3-demo

Demo: https://youtu.be/GLVFr3ABoGg

Things changed from Roll-a-ball:

1. Automatically place the power-ups in a script at start-up.
2. A power-up manager that spawns new power-ups randomly across the playground and deletes them after a brief time.
3. A NPC with navagent to chase for the power-ups
4. A player can collect power-ups to change it appearance.

Credits