RFR: 8316372: Monkey Tester Application Part 3

[Andy Goryachev]

Further changes to the MonkeyTester application:

- remember split pane divider ✔
- use 'private' instead of 'protected' in many cases ✔
- added more scripts to the 'writing systems' text sample ✔
- added RTL window control menu ✔
- added embedded swing/fx in tools ✔
- added copy popup menu in clipboard viewer ✔
- added the custom css field to the css playground tool ✔
- added many new pages ✔
- split XYChartPage into separate pages ✔
- switched to use property sheets (some choices might be incomplete) ✔

https://github.com/andy-goryachev-oracle/jfx/blob/8316372.monkey/tests/manual/monkey/README.md

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Commit messages:
 - whitespace
 - tool bar
 - Merge branch 'master' into 8316372.monkey
 - whitespace
 - whitespace
 - whitespace
 - 8316372: Monkey Tester Application Part 3

Changes: https://git.openjdk.org/jfx/pull/1406/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1406&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316372
  Stats: 10052 lines in 103 files changed: 5842 ins; 3338 del; 872 mod
  Patch: https://git.openjdk.org/jfx/pull/1406.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1406/head:pull/1406

PR: https://git.openjdk.org/jfx/pull/1406