* Begin API evolution to a more native win32 API

* Child-window based hosting

* Plumb through an initial size for child window to avoid reallocated surface on start

* Windows API cleanup part 1

* Fix wrapper tests

* Ensure flutter's HWND resources are destroyed

* Final API cleanup

* Fix dynamic DPI handling

* Cleanup

* Fix a bug that was causing engine to not be shutdown correctly

* CR feedback

* auto format

* CR feedback: combine FlutterView and FlutterViewController

* The one that clang-format seems to always get wrong

* expletive

* fix sources for licesnse file

* CR Feedback

* cleanup

* Update GetNativeWindow() to return an HWND rather than a long

* fix formatting