Some refactoring towards using 2D/3D splines generically.


git-svn-id: https://svn.code.sf.net/p/vpinball/code/trunk@1121 14438d79-0ffd-4333-8ae7-ea2bdd901387
Fixed bug with D3D forcing the FPU into single-precision mode.


git-svn-id: https://svn.code.sf.net/p/vpinball/code/trunk@1122 14438d79-0ffd-4333-8ae7-ea2bdd901387