flutter/engine#7558 Fix lost touch events for iOS platform views

flutter/plugins#1157 [google_maps_flutter] Fix camera positioning issue on iOS

flutter/plugins#1176 [firebase_auth] Fix Firebase phone auth on Android

flutter/plugins#1037 [camera] Save photo orientation on iOS

flutter/plugins#1129 [android_alarm_manager] Fix “background start not allowed” issues, queue events that are received too early

flutter/plugins#1051 [image_picker] Fix crash on iOS when the picker is tapped multiple times

The webview_flutter plugin got a communication channel between Dart and JavaScript:

flutter/plugins#1116 Add WebView JavaScript channels (Dart side)

flutter/plugins#1130 WebView JavasScript channels Android implementation

flutter/plugins#1139 WebView JavaScript channels - iOS implementation