RFR: 8031: Remove the Twitter plug-in

[Marcus Hirt]

Too big of a maintenance burden now that Twitter is updating APIs.

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Commit messages:
 - Fixing the remote launcher
 - Updating launchers
 - 8031: Remove the Twitter plug-in

Changes: https://git.openjdk.org/jmc/pull/464/files
 Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=464&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8031
  Stats: 2015 lines in 36 files changed: 0 ins; 1987 del; 28 mod
  Patch: https://git.openjdk.org/jmc/pull/464.diff
  Fetch: git fetch https://git.openjdk.org/jmc pull/464/head:pull/464

PR: https://git.openjdk.org/jmc/pull/464