<i18n dev> RFR: 8325558: Add jcheck whitespace checking for properties files

[Magnus Ihse Bursie]

This is an attempt to finally implement the idea brought forward in JDK-8295729:  Properties files is essentially source code. It should have the same whitespace checks as all other source code, so we don't get spurious trailing whitespace changes or leading tabs instead of spaces. 

With Skara jcheck, it is possible to increase the coverage of the whitespace checks.

However, this turned out to be problematic, since trailing whitespace is significant in properties files. That issue has mostly been sorted out in a series of PRs, and this patch will finish the job with the few remaining files, and actually enable the check in jcheck.

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Commit messages:
 - 8325558: Add jcheck whitespace checking for properties files

Changes: https://git.openjdk.org/jdk/pull/17789/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17789&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325558
  Stats: 761 lines in 95 files changed: 0 ins; 5 del; 756 mod
  Patch: https://git.openjdk.org/jdk/pull/17789.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17789/head:pull/17789

PR: https://git.openjdk.org/jdk/pull/17789