Allow User to Specify Calibration Font

[kengineer]

In the current implementation, during calibration, ugfx will attempt to open 2 calibration fonts. If either of these are missing, they will be replaced with a wildcard font open. In my particular case, this is problematic because I am not including the calibration font types and the wildcard font that gets opened happens to be a user font I've defined that isn't valid for displaying calibration text dialogs.

 

I see two solutions to this:

1. Add #defines to allow user to define calibration fonts 1 & 2 in gfxconf.h
2. Add an api call to allow user to set default calibration fonts at runtime.

[Joel Bodenmann]

I put this on our ToDo list. I agree that this is something that should be taken care of.