Move spline generation to SplineCommon, make SplineDX9.cpp identical to Spline.cpp (merge later somehow)
More convergence (tex stuff)
d3d: Set texture only when enabled.

This allows optimizations that were applied to the cmd flags.
dx9: More execute functions
Only show the graphics API on the title screen in Windows
Merge pull request #6899 from unknownbrackets/gpu-convergence

d3d: Set texture only when enabled
Merge pull request #6900 from hrydgard/gpu-convergence-2

Gpu convergence 2 - break out much of the Spline code into GPU/Common, fixes some minor things