Started working on a plot system
Planets are now generated from scenes, and the plot can now be advanced in a simple way
Refactored the plot integration, now it's more according to the E-C design pattern.
Added support for closing doors
Renamed and added some textures for the doors
Added so the spritename is saved in the instance
Doors now change textures based on if its open or closed
Renamed textures
Cleaned up the class, and javadoced
Started on a spaceship
Now MEET actions also work in-game
Merge branch 'dev' of https://github.com/ravertass/KandidatRoguelike into dev

Conflicts:
	se/chalmers/roguelike/Engine.java
	se/chalmers/roguelike/Entity.java
	se/chalmers/roguelike/InputManager.java
	se/chalmers/roguelike/Systems/RenderingSystem.java
Now object actors in the KILL action can be added to planets, hooray!
Now, the KILL action seems to be fully integrated.
Fixed bug with doors not closing
Fixed so stairs spawns player at right position
Merge branch 'doors' into dev

Conflicts:
	se/chalmers/roguelike/World/LevelGenerator.java
Merge branch 'stairs' into dev

Conflicts:
	se/chalmers/roguelike/Engine.java
	se/chalmers/roguelike/Entity.java
	se/chalmers/roguelike/World/LevelGenerator.java
Fixed a small bug
added FieldOfWiev as req for AI