Fixed JavaVM so it is automatically detached from a thread when thread exits (stops VM crash on thread exit ever happening)
Move JavaVM access into the application code.
Add utility Java call-in class to make it easier to use Java objects from C++ side.
Implement GetSystemErrorMessage to aid in debugging.
Expose some internal Android EGL data for use in plugins (i.e. the movie plugin).
Add access to Java AssetManager object.
Change Android OBBs from plain PAKs to uncompressed ZIPs of the staged content to allow both multiple PAKs and to allow non-PAK content. In particular this allow movies to be in the OBB as they need to be directly accessed.
#codereview Josh.Adams, Chris.Babcock
[CL 2362008 by Rene Rivera in Main branch]
