RFR: 8169285: Re-enable javafx.swt tests [v4]

[Marius Hanl]

> This PR enables `javafx.swt` tests for:
> - Windows
> 
> Disabled on:
> - Linux, since some distros seems to have problems
> - MacOS: The following warning is printed right before the error: `***WARNING: Display must be created on main thread due to Cocoa restrictions. Use vmarg -XstartOnFirstThread`

Marius Hanl has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - Merge branch 'master' of https://github.com/openjdk/jfx into 8169285-swt-tests
 - SWT_TEST default is false on Linux
 - SWT_TEST default is false on MacOS
 - 8169285: SWT tests should run with IS_FULL_TEST
 - 8169285: Re-enable javafx.swt tests

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1783/files
  - new: https://git.openjdk.org/jfx/pull/1783/files/eabc48a2..a0f0cb88

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1783&range=03
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1783&range=02-03

  Stats: 118179 lines in 231 files changed: 27243 ins; 50822 del; 40114 mod
  Patch: https://git.openjdk.org/jfx/pull/1783.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1783/head:pull/1783

PR: https://git.openjdk.org/jfx/pull/1783