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See scripts/runtestsuite/runtestsuite.py

Issue originally from appleseedhq/appleseed#2847

Currently BL_Shader (and derived KX_2DFilter) can setup a shader only by passing the code of each processing units.

The idea of this issue is to allow the user passing file name ending with .glsl:

sources = {
    "vertex" : "vert.glsl",
    "fragment" : "frag.glsl"
}

shader.setSourceList(source, True)

Hey Nutti, big thanks for making this addon,
when I try to use the UV pack extension, at first it appears to work in the UV window, but on closer inspection, although the verts are properly welding between the two islands being stacked, one of the islands ( in this case those at the top) has had each of its faces made into a separate island, and those faces/islands are rotated (seemingly 90 degr