Basic AI.
Added name caching for contentloadauto
Removed GetImage, since 'twas an awkwards/questionably useful method
Added ImageTint
Cells/tiles no longer depend on their graphical representation for position
Entities no longer have position, only an owning tile.
Basic wandering AI/Fixed z layering (hack)

Add/remove during update of cells
(Perf issue?)
Merge branch 'master' of https://github.com/zdawson/Marooned

Conflicts:
	Marooned/Marooned/src/Marooned.cs
	Marooned/Marooned/src/world/World.cs
Brought some sanity to Map view

Changed point sampling to anisotropic filtering
Increased default resolution
Known Issue: Map does not auto-center correctly (disabled)
Fixed InputManager's accidential migration.