Bug fixes, AI tweaks, added ladders

- tweaked melee AI to navigate the office level better
- right click with the bandaid in hand to heal 10HP
- added toggle to projectiles (hurtPlayer)
- added ladders to the level generation
- fixed projectiles not spawning
- fixed enemy behaviour when in a group to follow the leader
- added toggle to change level size
- rocket boots spawn randomly in the office level (just for fun)