Support module refactoring

* Splitting support-v4 into two modules, support-compat and support-core
* Adding a new library module named support-v4 that combines the two
together for backward compatibility support of existing projects
* support-compat has all Compat classes, their few direct dependencies
and all data structures in the .util package

Change-Id: Icd1b0ab3a5b61a8a2bf85bc274098f0a828963e0
362 files changed