Evaluate ids in static_text

[dbalsom]

Thanks for the great tool! I'm going to use it to provide some default launch options for my emulator, which people have complained is hard to use :D

It would be nice if we could have id substitution in static_text components.

More specifically, I'd like a way to display the effective command line that was produced from the chosen component options, so people can copy it out and use it directly later, if they wish.

Sort of 'teaching people to fish' so they may not eventually need the GUI.