ZZFX Synth support

[Bubobubobubobubo]

This draft PR implements some boilerplate for ZZFX support.

[felixroos]

this looks almost ready..

I've tried to reuse as many params as possible. reused are:

• s
• note = 36
• freq
• attack = 0
• decay = 0
• sustain = 0.8
• release = 0.1

New are:

• slide = 0 (already a control in superdirt)
• zrand = 0
• curve = 1
• deltaSlide = 0
• pitchJump = 0
• pitchJumpTime = 0
• lfo = 0 (or repeatTime)
• noise = 0
• zmod = 0
• zcrush = 0 (like bitcrush but scaled differently)
• zdelay = 0 (a more simple form of delay)
• tremolo = 0

maybe find shorter names for deltaSlide, pitchJump, pitchJumpTime and repeatTime? or alternatively add aliases later

[Bubobubobubobubo]

I'm not sure if more aliases are a good thing for the moment. It will become quite hard to decipher what these do and their behavior is quite specific. I would say that it is ready enough as it is.