[Mod-host] Add feedback port support

[SrMouraSilva]

• Custom port number $ mod-host -f <port-number>
  • Mod-host start method
• Treat received messages: https://github.com/moddevices/mod-host/blob/1726ad06b11323da7e1aaed690ff8aef91f702b5/src/effects.c
  • param_set
  • output_set
  • midi_mapped
  • midi_program
  • transport
  • data_finish

Continuation of #54