[bisq-network/bisq] Upgrade JavaFX to v14 (#4242)

[cd2357]

Update the gradle dependency to JavaFX 14.

This brings to Bisq the latest JavaFX fixes and improvements, especially
 in the areas of UI performance and memory management.

JavaFX can be upgraded independently of the JDK used to build the
application, so this change is modular and does not affect other parts
of the build process.

Initial tests on Qubes already showed several improvements:
* faster, more responsive UI
* popups display correctly (before, 95% of the time they had width and height 0)
* system tray is visible

To use the new JavaFX version locally, the project has be to clean and rebuilt
via `./gradlew clean build` before running it.

Note: since [JavaFX also uses VRAM](https://wiki.openjdk.java.net/pages/viewpage.action?pageId=20415996) (in addition to the normal system RAM
as used by the JDK), it could be that previous attempts to optimize the JDK's
memory usage (like #3677 and #4048) might have had no impact on JavaFX-
specific inefficiencies.

Related / likely related to: #350 #2135 #2509 #3128 #3307 #3308 #3343
#3430 #3657 #3683 #3686 #3786 #3787 #3892 #3917 #3918 #3936 


You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4242

-- Commit Summary --

  * Upgrade JavaFX to v14

-- File Changes --

    M build.gradle (2)
    M desktop/src/main/java/bisq/desktop/app/BisqAppMain.java (5)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4242.patch
https://github.com/bisq-network/bisq/pull/4242.diff

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