Sketchfab API texture mixer (v0.04)

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A brief foray into the Sketchfab API for the mixing of 2 textures.

Default method uses the 'Emit' channel.
This is faster, but emit map needs to be loaded and set at 0.01 in SketchFab

Second (original) method uses a hidden canvas to mix textures.
Lo fi texture used while sliding. (may require 'disable local-file restrictions')

Additional comments in source.

More yet to be done. Chip in on Github