Add an option to allow cue playback to override whatever is captured in the command line

I was thinking primarily of a busking scenario where I could use direct selects to select groups and apply palettes but would still want a go command to take me to a known state. Another might be to ensure a blackout is always able to take full control even if one has temporarily brought up a fixture as cover for a failed unit. A sort of extra assertive assert. This could either be a user preference for the board as a whole, or perhaps implemented by assigning a certain priority to the command line so that higher priority commands can take precedence over what would otherwise be held by it.

tt2