Mobile navigation in full JUCE

[jrlanglois]

@DEADBEEF This FR might be of interest. Please vote if that’s the case!

FR: Cross-Platform Navigation Controller

A standard feature for mobile development, a navigation controller manages a stack of screens (where the stack can be finite, infinite, and clearable), handling switching between screens, back navigation, storing and restoring screen states, screen transition animations, and also handles deep-linking. Some example implementations: Apple: https://developer.apple.com/documentation/uikit/uinavigationcontroller?language=objc Android: https://developer.android.com/reference/androidx/navigation/Na…