* Added a built-in GLSL editor (press "E" to edit an effect)
* LightOutputNode allows interfacing with your custom lighting setups (see [light_output.md](light_output.md))
* Significantly improved console output (e.g. for when shaders don't compile)
* Added a "user library" in the user's home folder, which overrides the "system library"
* General path cleanup, no longer tries to write to system directories
release-20171216
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