Fix bug in Mat3x2 inverse.
Add Mat4*Vec4 transform.
Turn GL constants into Haxe constants inlining values. Perhaps
slightly less safe in the long run, but saves quite a bit of size
and pointless cost.
fuuuuuu fix bug in Mat3x2 * Vec4 rect.
pew pew pew
Permit passing null data for texImage1/2/3D
Fully purge GLConst.
.