- solved issue #292 where a new geometry renamed with many underscores failed to store the name in a saved project
- the name for the saved projects are updated to the current time and not to the time of the app startup
- some PEP8 changes related to comments starting with only one '#' symbol
- added a try - except clause for the situations when for a font can't be determined the family and name
- moved font parsing to the Geometry Editor: it is done everytime the Text tool is invoked
- made sure that the HPGL postprocessor is not populated in the Excellon postprocessors in Preferences as it make no sense (HPGL is useful only for Geometries)
implement executing of tasks inside worker thread
cleanups, reimplement Isolate/New/OpenGerber as OOP style Shell commands
disable edit during shell execution, show some progress
add ability for breakpoints in other threads and only if available
add X11 safe flag, not sure what happen on windows