Lua Node Internal Plugin

[mfisher31]

An internal plugin type which renders audio/midi with a Lua script.

• io/control port configs
• Bind render function
• Bind prepare/release
• Bind save/restore state
• Script validation & error handling
• Handle parameters
  • Show input controls in default UI
  • Send value changes to DSP instance
  • Retain values when loading new script and params haven't changed

[mfisher31]

... ready for testing. now enabled in release build projects.