Florian Dehau 0ffea495b1 refactor: implement cascading styles
- merge `Style` and `StyleDiff` together. `Style` now is used to activate or deactivate certain
style rules not to overidden all of them.
- update all impacted widgets, examples and tests.
2020-07-17 20:58:20 +02:00
..
2020-07-17 20:58:20 +02:00