Merge changes I38145a51,Iac1fdabc,I90f18181,I76b979dd,Id2e17923, ...

* changes:
  ApiLint: Add operator keyword and property parsing
  ApiLint: Add Kotlin-style type support
  ApiLint: Performance improvements for verification
  ApiLint: Performance improvements for 2.0 signature format parsing
  ApiLint: Allow parsing 2.0 API signature files
  apilint: Fix API lint issues 2/2
  apilint: Fix API lint issues
  API Lint: Add support for base current.txt
  Guide towards Context.createPackageContextAsUser().
  Moar lint rulez!
  Update lint rules for graphics/text package layering
  Handle new current.txt format.
  Extend lint script to emit API statistics.