* added alot of examples for D3D11
 * added first working D3D11 AND OpenGL sample program (other samples are currently not compileable, will fix that in another commit)
 * FBXMesh currently doesn't produce an IndexBuffer for testing purposes (D3D IndexBuffer has a problem, but VertexBuffer works so far)
 * fixed bug in VBO in D3D
 * added a staging VBO for D3D to read and write the vertex data (BufferAccessMode is ignored so far, more settings on how to configure the vertex buffer and how to use it will follow in future)
 * extended D3D sample to load and display real FBX Meshes correctly