Added a main loop
Merge branch 'master' of https://github.com/Laranto/airship-crew

Conflicts:
	src/display/MainDisplay.java

(Whoopsy, forgot to pull...)
Now uses a map of tiles (size can be specified so you can have multiple maps that are exchangeable with different sizes. For Docking bays and airships for example)
Maps consist of tiles. The tiles will contain the base (some kind of wall floor or empty space) and the things on it.
Size is defined in Constants.java

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