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We need this to plumb the per-sampler border color into the GPU's
sampler border color
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Texture sampling now happens entirely in SoftGPU thus this class will
now only be used to hold the sampler configuration.
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In OpenGL, texture coordinates can have up to 4 values. This change
will help with easy application of texture coordinate matrix
transformations in the future.
Additionally, correct the initial value for texture coordinates to
`{ 0.f, 0.f, 0.f, 1.f}`.
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This extracts the sampler functionality into its own class.
Beginning with OpenGL 3 samplers are actual objects, separate
from textures. It makes sense to do this already as it also
cleans up code organization quite a bit.
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