Potentially Missing API Features

[Ross]

Setting a uniform color parameter is missing on Shader.

• sfShader_setColorUniform is missing in SFML.Net, obsolete Set color parameter is still present.

Bind method for VertexBuffer is missing and probably limits use cases with raw OpenGL calls

• sfVertexBuffer_bind is not defined in SFML.Net

[Lukas Dürrenberger]

Fixed with #216