RFR: 8271395: Crash during printing when disposing textures [v4]

[Florian Kirmaier]

> This PR switches the Thread to the QuantumRenderer, in the case the Disposer is called from another Thread - the printing Thread.
> I'm open for better solutions on how to fix this Issue.
> Initially i thought there is also a Race Condition in the resource pool, but a new one is created for the Printing Thread.

Florian Kirmaier 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 four additional commits since the last revision:

 - Merge remote-tracking branch 'origin/master'
 - JDK-8271395
   changes based on codereview
   We now catch Throwable instead of Exception
 - JDK-8271395
   QuantumRenderer is no longer public
 - JDK-8271395 Fixing crash at printing
   Switching to the QuantumThread fixes the native crash when cleaning Textures.

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Changes:
  - all: https://git.openjdk.org/jfx/pull/618/files
  - new: https://git.openjdk.org/jfx/pull/618/files/a41f41dd..27bf8836

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=618&range=03
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=618&range=02-03

  Stats: 999433 lines in 11556 files changed: 592004 ins; 268584 del; 138845 mod
  Patch: https://git.openjdk.org/jfx/pull/618.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/618/head:pull/618

PR: https://git.openjdk.org/jfx/pull/618