Increase maximum FFT resolution#176

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jwt27 wants to merge 3 commits intojketterl:developfrom

jwt27:jwt27/split-waterfall

Commits on Sep 20, 2020

split waterfall over multiple canvas elements to increase maximum fft resolution
jwt27
committed
measure waterfall min/max in two passes, to prevent stack overflow on high fft sizes.
jwt27
committed

Commits on Sep 29, 2020

clamp waterfall canvas width to 100% for fft_size < canvas_max_width
jwt27
committed

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