Refactor: Rewrite ValueTree to use APVTS and params

[madskjeldgaard]

• [x] Rewrite all channels to use parameters
• [x] Write Attach class for a channel
• [x] Connect all channels to GUI via Attach
  • [x] MsgType -> add attachment to channel editor
  • [x] Mute Button -> add attachment to channel editor
  • [x] Attach Port using parameterattach
• [x] Register non-audio parameter parameters via callbacks/listeners in processor
  • [x] Add callback for Path
  • [x] Add callback for inMin
  • [x] Add callback for inMax
  • [x] Add callback to connect when port is changed
  • [x] Add callback to update "connected" label
• [x] Re-enable state loading/saving