Refactor the native interface in preparation for switching iOS to use WKWebview.
* Finally rename the folder for device specific interfaces as `tablet` instead of `iPad`
* Update `import` statements to use the new name
* Create new `iOS.js` and `Android.js` based on previous `iPad/iOS.js` to separate the interfaces
* Add new `OS.js` class to manage the class variables, initialize the device interface delegate methods to the correct interface.
* refactor how `utils/lib` detects the current platform based on `navigtor.userAgent` based on https://stackoverflow.com/questions/37591279/detect-if-user-is-using-webview-for-android-ios-or-a-regular-browser. previous method relied on the Android interface being loaded or not. It can be difficult to detect the difference between in a browser and in a webview, but for now ScratchJr doesn’t need to worry about running in a browser
* Remove ScratchJrApplication class - it was only being used to initialize the old Google Analytics.
* Change AppUsage (home, school, other, noanswer) from being a prefix on `label` to being a Firebase user property.
* Set the user property when loading the index page - it shouldn’t change for the rest of the session.
In ../src/editor/ui/UI.js there's a random hardcoded value of 136 that helps determine the scale of fullscreen mode. Not sure what this number represents but it should be a variable.
Added:
- German
- Japanese
- Portuguese
- Swedish
- Chinese (China)
Needed to modify Localization utilities to handle China locale in additional to language.
* Adds a usage cookie
* Only asks for usage on first launch
* will need checking with the official version to make sure the right elements are showing/hiding.
In the current system you can’t have the same sound playing more than once at the same time - this is how it was implemented on Android, so we used the same restriction on iOS.
However in the previous version if you interrupted the sound to play it again, it continued from where it was instead of starting over. So it didn’t appear to do anything. Added resetting the current time to 0.0 on play to restart sounds.
