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* Android tap-to-focus and improved (continuous) auto-focus Tap-to-focus - On tap, compute focus area around motion event's location, and pass this to the camera parameters as the new focus area. - Adds RCTCameraUtils.java file, so far with only a single function that helps compute the focus area from a motion event. This file can serve as a location for utility constants and functions for the rest of the app, where such things can be extracted out. Improved (continuous) auto-focus - Use FOCUS_MODE_CONTINUOUS_PICTURE/VIDEO when possible to enable continuous auto-focus; fall back to FOCUS_MODE_AUTO otherwise, if able. Other changes - Update README to specify differences between iOS and Android for focus and zoom functionality. - Update AndroidManifest with more thorough list of permissions and features. - Update Example package.json react and react-native dependencies to match root package's package.json. * Example: default empty onFocusChanged callback - Enables default tap-to-focus behavior in Example app, facilitating testing of focus features in the Example app