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attempt to make the default setting more responsive.

This adds a UI to specify desired trend, with a default of "auto" that
selects a value appropriate for the span.

The full font select seems unnecessary.

also some cleanup of iss131a MR

Added gui options for changing the font and background color [issue 131].

See merge request !15

Also creates custom more visible legend, and adds some appropriate interfaces to the GUI.

closes #131, #142, #157

should fix a couple of issues where "traces disappear", which
appear to be due to missing data.

Don't allow zooming/panning past now, or past a minimum GPS time, or
in smaller than 100us

closes #35

This sets to tick spacing to a convenient values based on span.

closes #165

always used primary trace

for better rendering performance

closes #164

helps prevent bad precision for long time scales

closes #165

closes #167