Allow mounting resource archives manually

[akrause-ms]

Is your feature request related to a problem? Please describe (REQUIRED):
In the current mounting system, there is no way to control which files will be selected for boostrap. This may cause loading errors before any line of client code has been invoked. As an example, you can take OBB files on the Android platform, which in most cases are downloaded together with the APK file during upgrade in the Google Play Store, but there are cases where this does not happen and the old OBB file is used. As the Budle file has higher priority when selecting a given file in the virtual file system, this may cause format errors when loading first game entry points.

Describe the solution you'd like (REQUIRED):
Having a flag in game.project that will allow you to disable auto-mounting and require the user to take care of which bundles will be used and at what point.

Describe alternatives you've considered (REQUIRED):
Having native liveupdate API support and entry point before bootstrap resources are loaded.