ESP32-SIDView waveform renderer

Some progress on the SID Viewer at last :-) Big thanks to @tixlegeek for helping me getting this achievement unlocked \o/ - Oscillo view : OK - ADSR : Ok ... ish - Filters : work in progress Code will eventually get released here: - https://github.com/tobozo/ESP32-SIDView Credits: - https://github.com/hpwit/SID6581 - https://github.com/lovyan03/LovyanGFX