JWildfire 8.20 release notes

List of changes: -upgraded the GPU render to CUDA 11.8, works also on NVIDIA 4xxx GPU’s now -new “Underwater”-random-flame-generator, most generated flames also work well with the GPU render -new “RANDOM_BG_COLOR”-mutation, makes it easy to play with different backgrounds for “Underwater”-flames -fixed a bug in the GPU-implementation of “loonie2” -added a non-ugly flame for selftest of the gpu render (selftest.bat in the FARenderJWF-folder) -adjusted the variation-type of many variations, leading to better random-flames in some cases -slightly improved the quality of various random-flame-generators -when using GPU render, automatically convert background-gradients to an average background color (because GPU render currently only supports a single background color)