flutter_package / flutter_screenutil

Before, when using r extension, bottomRight is copied from `bottomLeft.r` not `bottomRight.r`.
bottomRight should be copyWith `bottomRight.r`

Fix resizing and add rebuildFactor property.

Performance tip: rebuildFactor is for those who want to set some breakpoints or to rebuild based on steps

This reverts commit dc21e4a7.

example添加textfield方便测试

Bug Fix: Reaching context that no longer used. (state: DEFUNCT)

* Fix initializing with Size(0, 0)

Only in Production Mode, Flutter starts quicker and the native platform reports the actual resolution in a certain delai. This update only wait for the real resolution.

* Upgrade to latest gradle version and enable Jetifier and use AndroidX

* Update example flutter version

* Optimize BugFix and some boilerplate removal

* Update example app

* Fix creating adaptive radius using extension

* Update example/ios/.gitignore

* Update README.md

* Update screenutil_init.dart

Follow package layout conventions and add some useful extensions