added VPVL2_LINK_GLSLOPT and it's implementation
follow changes of previous commit (GLSLOptimizer option)
revert vpvl2FXSaturate
use Common.h instead of config.h
remove LiSPSM test code
added GLSLOptimizer to license.qrc
static storage modifier
take emissive color not ambient
use texture reference instead to prevent unexpected texture behavior
moved end pointer at first