Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Replace tika by overviewproject mime-types to detect mime types
  Upgrade bazlets to latest stable-3.0 to build with 3.0.13 API
  Avoid any uses or lookups of ffmpeg by Tika

Change-Id: I5623b878e7f8bcdec44f768a91487463a86d3a16