lush: move to 50Hz highpass filter
lush: rearrange patterns
lush: remove gain intercept/slope deadcode
lush: switch to 3000Hz high pass filter and enable
lush: fix magnitude average code
lush: get some reasonable fft_reduce logic
lush: move spectrum patterns to Pattern_audio
lush: Pattern_spectrum_bars: fix up peak hold
lush: clean up fft_reduce
lush: add fft scaling control
lush: somewhat fix up peak patterns
lush: re-enable all patterns by stripping out unused functions
lush: Pattern_huey: add control of current hue and offset
lush: Pattern_plasma: allow knob to change palette