Added VertexElementFormat enumeration
Added VertexElementUsage enumeration
Specified glPointSize for non-mobile platforms
Added fixed 33ms timestep to Game
Added additional namespaces to VertexElementFormat and VertexElementUsage
Added IVertexType interface
Added VertexDeclaration struct
Added VertexElement struct
Changed background Minigame color to black
Updated Windows project files
Removed .filters file from .gitignore
Added project filter files