1840 [local_auth] Fix usage syntax on README (cla: yes)

1844 [image_picker] Fix image_picker Hanging After Attempting to Open Unavailable Camera on iOS Simulator (bugfix, cla: yes)

1845 [webview_flutter] Basic fix for input pre N (cla: yes)

1846 [firebase_auth] [google_sign_in] Update consent screen docs (cla: yes)

1848 [url_launcher] add support for android headers (cla: yes)

1849 [android alarm manager] Fix crash below API 19 (cla: yes)

1850 [firebase_analytics] add missing named events tracking (cla: yes)

1852 [webview_flutter] Support Flutter TextInputs (cla: yes)