The game can be reset, tried out a light engine

More details:
- Stunned enemies now stop animating, but is always facing right
because quads for the duck is not implemented
- Made so the player variable could be deleted. But it's not pretty
because now there's a bunch of if statements checking if player exists
- Changed collision_world to world.collision
(for easier management, ex reseting)
- Separated world's initial spawning from World:initialize to
World:initialSpawning(),
(partially because it interfered with moving of the world collision)
- Added a light library, only creates light at the moment, no shadows
- Changed music to try out new mood
- 's' key now changes scale (for debugging)
- Time machine can now be repaired
Merge branch 'master' of https://github.com/syltman/parrotGame

Conflicts:
	src/specs.lua