[FEATURE] Dynamic visual changes

[vintagepc]

Is your feature request related to a problem? Please describe.

Investigate how practical it is to do dynamic visualization changes. Specifically, have GLPrint store the original data so it can recalculate the colourization on the fly. It should also be possible to change the actual rendering mode dynamically as a result; but this won't "gain" any data as a result of (e.g.) changing from an averaged mode to an HR mode.

This could allow us to scuttle the command line flags entirely if there's a menu to choose what visual option is desired.

Probably not a bad idea to make use of the "HaltExecution" scripting option so that we aren't trying to push more data on the pile while recalculating what has already been accumulated.