RFR: [bworld-apis] Adding more bangs to collections

[Vicente Romero]

adding more bangs to collection apis

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Commit messages:
 - removing hack
 - continuation apis
 - another part of the hack
 - api changes continuation
 - another part of the hack
 - other changes
 - increasing the max number of warnings
 - additional changes
 - nasty hack
 - [bworld-apis] adding more bangs to methods in java.util.Collection

Changes: https://git.openjdk.org/valhalla/pull/2112/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2112&range=00
  Stats: 456 lines in 67 files changed: 7 ins; 0 del; 449 mod
  Patch: https://git.openjdk.org/valhalla/pull/2112.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2112/head:pull/2112

PR: https://git.openjdk.org/valhalla/pull/2112