Add procedural noise textures #1615
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This PR adds auto-generated (white) noise textures. The generation can be tweaked through several parameters. I added a unit test to verify that it's working. The texture is currently used to simulate the film grain effect. I also increased the strength of the effect from "noticeable-only-if-you-stare-really-hard" to "really subtle". There's probably some more improvement possible, but that's not the focus here.
The pre-computed noise textures was deleted, since it became obsolete