[video_player] Rename internal method channels (flutter#5045)

[video_player] Rename internal method channels (flutter#5045)

[in_app_purchase] Adds additional explanation on the importance of co…

…mpleting a purchase (flutter#5017)

[file_selector] Update macOS README and example (flutter#5034)

[flutter_plugin_tools] Fix subpackage analysis (flutter#5027)

[image_picker] Fixes activity leak (flutter#4439)

[ci] Run analysis with older versions of Flutter (flutter#5000)

[video_player] Add new option for allowBackgroundPlayback (flutter#5013)

[camera] Fix for CameraAccessException that prevents image capture on…

… certain devices running Android 7/8 (flutter#4572)

[camera]remove CAS operation and use dispatch queue instead (flutter#…

…4973)