This PR contains a large number of changes in support of the implementation of the Medley Dsplay Fon file format.
The changes are documented in the docs/internal/FONTCHANGES.TEDIT file.
This now builds in knowledge of which Titan and Terminal fonts actually exist, so it doesn't try to increase the size to a black hole. Still a hack, but there are so many MOVD's involved that it is really hard to see how to do it with a generic FIND-NEXT-LARGEST-FONT.
