Persist full interface state across application instances

[yestinj]

Persist as much UI state information as possible across re-launches of InetVis.

This should allow users to continue exactly where they left off, i.e. in monitor mode or replay mode? If reply mode, then which file was open, where in the file where we, what was the time scale and display interval, what was on the main display at the time, reference frame and plotter settings, and so on.

This may need to be split into two issues, i.e. 1) Persist all of the obvious settings such as plotter settings, reference frame settings, etc.. and 2) Persist the more complicated aspects such as mode, file loaded, position in file, data on screen, etc..