More fixes

- Fixed stopping velocity from releasing up/down after getting off of ladder
- Fixed springs launching different speeds / not launching at all
- Springs now launch Enemy actors (And any other moveable physics actor locked in the 2d axis)
- Created "Ball" actor which can also kill the enemy
- Added a new animation for broken ledges
- Destructible platforms now collapse after an actor spends a specific time on top of it
- Ladder code fixed so overlap methods now work for other actors,