Child scripts

[jalovatt]

This should be possible without much coupling to the GUI.

Basic

• The child script is a completely separate, standalone file i.e. a GetUserInputs replacement or file browser
• It uses a static pair of ExtStates (Scythe -> ParentScript, ChildScript or something)
• It reads one state for startup data, and writes to the other before exiting
• Function for:
  • Registering the child script as an action
  • Running the child script via Main_OnCommand
  • Deferring a function to poll the ExtState for changes when the child script is finished
  • Unregistering the child script
• Function for reading + writing to the static ExtStates

Fancy

• The child script can be written in the parent script, then dumped to a file using string.dump. Can Reaper load a script from bytecode?
• This would allow using an upvalue to pass parameters and a GUID for the ExtState or a gmem location to use.