4451 upgraded usage of BinaryMessenger (cla: yes, p: android_intent, p: camera, p: url_launcher, p: quick_actions, platform-android, platform-web)

4453 A partial revert of the work done to accomodate Android Background Channels (cla: yes, p: android_intent, p: camera, p: url_launcher, p: quick_actions, platform-android)

p: url_launcher - 11 pull request(s)

4156 [url_launcher] Add native unit tests for Windows (cla: yes, p: url_launcher, platform-windows)