A3DGE Code

* Fixed Application object destruction in unit a3dge.
+ Added routine to map texture on box.
* Fixed Wavefront .obj loader loading vertices with more than 3 components and
also the materials path that failed on some cases.
* Aded TOctreeNode.GetChild method.
* Method CheckCollisions moved from TOctree to TWorld3D.
* Fixed frustrum definition when creating camera. Projection is more accurate
now.
* Fixed camera initialization sample on documentation.