Notable changes:
- 5a2554d Fix combo box popup issue (#38)
- 7b1e56e Fix bug where sort icon occupies space even when not shown (#48)
- d835e29 Tweak ToggleSwitch style to match the design
- 32c64f1 Tweak ContentDialog style to match the design
- 7fc8d4c Refine shadow
- ce3698c Enable shadow by default for ContentDialog
- a54ae79 Use layout rounding by default
- dcae0da Fix maximized window padding
- 1270e86 Fix SimpleTimePicker accept and dismiss buttons' foreground in dark theme (#21)
- 19da839 Add "pressed" state to Hyperlink
- d3e87dd Add ContentPresenterEx
- 30108b7 Improve high contrast support
- 261560f Add automation peer for ProgressRing
- 43690eb Rework dark theme TextBox and RichEditBox