Enhance various objects
Add ModelableInterface
Add Irrlicht dependency and beginning the Scene implementation
Implement isBetween for graph walking
Merge branch 'master' into city-modeling

Conflicts:
	src/Graphics/Render/Model3D.h
Creating device object to initialize Irrlicht + continuing scene nodes
Implement SharedEntity
Implement CameraSceneNode, corrections on SceneNodes and add ThreadableInterface to the Device
Merge branch 'master' into procedural-generation-base

Conflicts:
	src/main.cpp
Basic test with IrrlichtDevice and threads
Add base of chunk data structures
Merge branch 'master' into 3d
Merge branch 'city-modeling' into procedural-generation-base

Conflicts:
	src/main.cpp
Thread fix
Merge branch 'master' into 3d

Conflicts:
	src/main.cpp
Use of dynamic_cast on Irrlicht node objects to avoid code duplication
RenderableComponent and continuing Scene
Implement RoadNetwork model
Implement 2D polygon
Implement simple building model