3.0.0

Release 3.0.0 (2020-04-06)

Baseline: 3c7cc74

Cherry picks:

• 19e214b:
  Use prefix encoding for paths.
• 63b01f7:
  Avoid file operations in the sandbox creation critical path.
• 80a2d7c:
  Implementation (but not plumbing) of the gRPC remote downloader
• 586eabf:
  Implement RemoteDownloader w/ --experimental_remote_downloader

Release notes: https://blog.bazel.build/2020/03/31/bazel-3.0.html

This release contains contributions from many people at Google, as well as Alessandro Patti, Benjamin Peterson, Christy Norman, Dave hughes, David Haxton, David Neil, garyschulte, George Chiramel, George Gensure, Gibson Fahnestock, Greg Estren, Greg, Jason Hoch, Jin, John Millikin, Jonathan Springer, Keith Smiley, Laurent Le Brun, Ulf Adams, Yannic Bonenberger, Yannic, Yihong Wang, Yuchen Dai.

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