* try to convert to idomatic Rack code
* tightened up Percall/Hexmix polyphony logic

* try older build machine for linux

# Conflicts:
#	plugin.json
#	src/ABC.cpp
#	src/DualAtenuverter.cpp
#	src/EvenVCO.cpp
#	src/Mixer.cpp
#	src/Rampage.cpp
#	src/SlewLimiter.cpp
#	src/SpringReverb.cpp
#	src/plugin.hpp

Signed-off-by: hemmer <915048+hemmer@users.noreply.github.com>

Signed-off-by: hemmer <915048+hemmer@users.noreply.github.com>

Signed-off-by: hemmer <915048+hemmer@users.noreply.github.com>

Signed-off-by: hemmer <915048+hemmer@users.noreply.github.com>

Signed-off-by: hemmer <915048+hemmer@users.noreply.github.com>

Signed-off-by: hemmer <915048+hemmer@users.noreply.github.com>

Signed-off-by: hemmer <915048+hemmer@users.noreply.github.com>

Signed-off-by: hemmer <915048+hemmer@users.noreply.github.com>

Signed-off-by: hemmer <915048+hemmer@users.noreply.github.com>

Signed-off-by: hemmer <915048+hemmer@users.noreply.github.com>

Signed-off-by: hemmer <915048+hemmer@users.noreply.github.com>

Wire in VCA decay CV.

- only downsample a source wave generated at higher sample rates
- switch to Pade approximation of sin
- new panel SVG from Befaco
- fix LED logic

Moved all chowdsp library code into specific header.
Updated .json

Made final row behaviour configurable in the menu (as is the case in the hardware).

* some code cleanup
* Percall strength should be calculated every sample

* only up/downsample if needed

* use simd for polyphonic logic
* only process CV / lights every N samples