RFR: 7062: Update to the Eclipse 2020-12 platform [v3]

[Marcus Hirt]

> Also updating the babel bundles for the 2020-09 platform.

Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:

  Adding proper project files

-------------

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/185/files
  - new: https://git.openjdk.java.net/jmc/pull/185/files/3e791d41..9d784322

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=185&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=185&range=01-02

  Stats: 18 lines in 2 files changed: 0 ins; 0 del; 18 mod
  Patch: https://git.openjdk.java.net/jmc/pull/185.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/185/head:pull/185

PR: https://git.openjdk.java.net/jmc/pull/185