Finetuned movement physics

- Back to using PlayerMovementController
- Changed attributes under main.unity's Input Preferences
- X and Y axis Gravity to 20 and Sensitivity to 10
Player movement control tools

- Physics material applied to player
-- Controls acceleration, deceleration, bounciness, etc.
- Removed Box Collider from Player prefab. Uses Mesh Collider on the
actual crate object.
- Created new scene where player movement can be finetuned
- Jumping now takes into account player's current velocity