Baseline: 8dcf27e590ce77241a15fd2f2f8b9889a3d7731b

Cherry picks:

   + 7074bcff7d1fcba7230fec11ce1d155b6e3d51b1:
     Automated rollback of commit
     ed825a49ef18a87e75fcbc381bb9b656e83b04fb.

Important changes:

  - Allow \a \b \f \v escape sequences in Starlark.

This release contains contributions from many people at Google, as well as Alex Eagle, Benjamin Peterson, Bradley Burns, Dan Fleming, Fabian Meumertzheim, Greg, Xavier Bonaventura, Xdng Yng.