Updated entity classes
Delta time added.

From now all junk resources should not be added to the resources folder.
3D Model Peach Castle added as resource
Merged with Michel van Os's commit
Merged with Michel van Os 2
Merged with Tomas
Entity classes aangepast
Timer class added
Game and Gui are merged
Images added and a bit of codeconvention applied
Waves start/end/delete

Alot added, like alot!
Stats added to GUI
Alot of fixes
TerrainGen is moved to its own class

Added scaling paramater to the generation of terrain
Gravity added for creatures
Gravity improvement
Added creature detection
Crystal Joint added to Tower.
Merged
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