Update app support enough to build framework-res.apk, link
framework.jar against its generated files, and export it to
make.
Bug: 69917341
Test: m checkbuild tests docs
Change-Id: I7db29cd1f5fabb22e844483ecc7c38abfedbbe0a
Use aapt2 instead of aapt to compile Android app resources.
Also generate all files into srcjars instead of individual
sources.
Test: m checkbuild
Change-Id: I5a67991a0daf0017e8159b46fcff7d5564a91468