Import shared definitions from `/example`, and remove numerous forms of redundant code, including compatibility definitions. Also, fix a few minor issues with dialogs being too small in the test suites.
Add shared code between the examples, to reduce the amount of
boilerplate used in each example. Includes shared colors, Qt5/Qt6 compat
definitions, argparsers, and app startup/exec code.
Added `QDial` styling to known issues, and added a drop-in replacement for `QDial` (subclassing it) that consistently styles over all platforms and application styles.
Closes#42.
Alex Huszagh