Low memory conditions not handled.

[olegzil]

Android API:
Mapbox Navigation SDK version:
MapboxNavigation.onDestroy() is not called during low memory conditions. As a result, resources are not released and, if navigation is in progress, it is not terminated. This causes indeterministic behavior of the app.

The root cause is that the Android OS does not guaranty a call to onDestroy() during low memory conditions. When the app is backgrounded, onDestroy() is not called, but onCreate() is called when the app is foregrounded. The SDK expects onDestroy()/onCreate() calls to be paired.

Steps to trigger behavior

1. Using the emulator create a device with low initial memory
2. Start the Android demo App, or any other app that uses the SDK in that emulator
3. Start navigation and background/foreground the app.

Expected behavior

The navigation session should continue

Actual behavior

The App will either crash, display a black screen or enter some other indeterminate state.

[Guardiola31337]

Refs. #2255