RFR: 8328828: Monkey Tester Application Part 4

[Andy Goryachev]

Further additions to the MonkeyTester application:

- tree/table view column property sheets ✔
- new pages: button, checkbox, hyperlink, menu bar, radio button, toggle button, canvas, split menu button, dnd ✔
- properties... context menu ✔
- context menu: table columns, toolbar items ✔
- control.context menu option
- property monitor tool ✔
- accessibility logging ✔

- editable combobox for double values with pre-set list (e.g. Region: min/max width etc.)
- Page -> Snapped Split Panes menu option for the control container

This PR simply syncs up with the dev repository
https://github.com/andy-goryachev-oracle/MonkeyTest

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Commit messages:
 - whitespace
 - 8328828: Monkey Tester Application Part 4

Changes: https://git.openjdk.org/jfx/pull/1560/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1560&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328828
  Stats: 4341 lines in 85 files changed: 3599 ins; 430 del; 312 mod
  Patch: https://git.openjdk.org/jfx/pull/1560.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1560/head:pull/1560

PR: https://git.openjdk.org/jfx/pull/1560