- added scrollController to get the current scroll position of the body
- add physics to modify the ScrollPhysics to implement some cases of UI when developers need (by default still is BouncingScrollPhysics)
- Fixed Pixel line leak problem
- Added appBarColor support
- Added headerBottomBar support
- Added bottomSheet support
- Added bottomNavigationBar support
- Added centerTitle
- Sound null-safe release.
- Initial development release.