Notable changes:
- bc5d592 Move FontFamily resources out of theme dictionaries to make them easier to override
- aabe3f8 Simplify the usage of theme dictionaries
- d86b8df Fix "Cannot find resource named 'DefaultRepeatButtonStyle'" (#51)
- 0438fd8 Make it simpler to enable IntelliSense for XAML resources
- 6e67032 Add NavigationViewItemSeparator lightweight styling theme resources
- 454fd23 Simplify referencing system colors
- 9e553b4 Let HamburgerMenuEx respect CompactPane length for icon size