implement multitexturing (thanks @ptitseb)
add glMultiTexCoord1f, 3f(v) wrappers
improve gl current tracking
remove GL_FLOAT from accepted texture types
fix tex coords in CURRENT_BIT
improve some stack behavior with multitex
check before calling upstream glEnable/Disable
check before calling glClientActiveTexture
texture state only has two coords
fix CURRENT pointer
fix some issues with pointer copies
fix bug where dl_append_block uses the wrong block