Blender Git Loki

Three in one:

- textures: added support for new mixers (div, diff etc) to work on the
other map-to channels too, like ref or spec
Also it works on lamp and world textures
- brought back uncommented line of code that was removed by leon, to have
particle motion based on textures
- recoded the glPylonOffset hack to be nice function, this for future
testing.