s/DrawMode/PrimitiveMode
removed patterns for 'TextureTarget' & 'TextureBinding' on 'boundTexture'
added simple Mipmap & Cubemap container for Image2D
added some glTexParameter wrappings
init Quine.GL.Sampler module
added Sampler binding
documentation
added StateVar for 'TextureUnit' activation
documentation with refering to Quine.GL.Sampler