noisegen

This release mostly adds the ability to perform low-pass and high-pass filters on noise (which blur and do something like sharpen, respectively), allows equalizing lightness levels across a generated image, and includes a debug option to show if any noise is above 1.0 (red) or below -1.0 (blue). Some of the new features are meant to be used for things like https://blog.demofox.org/2017/10/25/transmuting-white-noise-to-blue-red-green-purple/ .

This is the first release here; you can choose either a JAR or a Win64 EXE (compiled with Graal native-image). The EXE is zipped because that saves a substantial amount of download size. See the README.md for details, or run with the -h flag.