Updated RenderPass's texture handling.
Removed clearing of buffers in GraphicsSystem.

Render passes clears the buffers.
Fixed error in VertexWriter.
Renamed TextureParam to Param, type is already in Texture.
Removed reference to old class RenderObject.
Fixed sprite vertex writer error.
Added method to get surface dimensions.
Added 2D matrix to gr types.
Added sprite coords getter functionality to SpriteSheet.
Added project GUI to build.
Removed some empty code.
Implemented project - vector multiplication.
Added transformation inversion operators.
Refactored some OpenGL wrapper code.
Added projection and picking methods for render passes.