Better support for RRO

[rylin8]

The setRawResource() API allows you to load a .dcf file from a raw resource instead of from assets. However, if this is done, and then the resource is dynamically changed using RRO, the original file is still cached in memory. Find a better solution to support RRO.

[rylin8]

Note: when the RRO is changed dynamically, a configuration change is triggered which we can hook into to clear the cached value.

[rylin8]

Notes for troubleshooting/changing RROs: https://source.android.com/docs/core/runtime/rro-troubleshoot