* Several sandbox manager improvements
- Bound sandbox manager to B key as it lists on the UI
- Bound entity spawner to F5
- Bound tile spawner to F6
- Made entity spawner and tile spawner toggle instead of repeated spawning new windows from the sandbox panel
* Move relevant keyfunctions from engine to content
Turns out it was unnecessary to have the key functions in the engine as all code using the ones added here are in content.
Various minor interaction features.
There is no concept of gravity in the game yet, so items drift through space or the hallways of a station until they are stopped. Thrown items do not collide with walls because making them collidable makes them collide with EVERYTHING, including the player. We need collision groups in the physics system.
Because of the previous problems the velocity things are throw at is set quite low, it can be tweaked after the other mentioned issues are resolved.
