Add render states

[alexpana]

• Antialiasing: http://docs.wxwidgets.org/3.0/classwx_graphics_context.html#a51e968476c72d3d77424cb8e11a14d65
• Interpolation: http://docs.wxwidgets.org/3.0/classwx_graphics_context.html#af6ecb449cb732632a8d9b5c285d01b91
• Composition Modes: http://docs.wxwidgets.org/3.0/classwx_graphics_context.html#a08a80e457f7bb28d0394c248de1742ef