This should take care of most of the class property conversions to
use the new annotation format (colon instead of equals) for
assignment. There may still be a few edge cases that were missed.
Bumped version to 1.2.1
Remove star imports
Split the bTrace file into two
Move the Panel and props code into the new file
Pep8 cleanup
Change the complicated switcher UI code Bools
replace them with one EnumProperty
This makes the second PropertyGroup not needed
Make optional layout configuration in the
preferences
Fix the crashes with the Drawing operator
Fix several crashes with wrong contexts
Some small UI fixes
More graceful error handling