Upgrade JavaFX to v14

Update the gradle dependency to JavaFX 14.

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

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.

Related / likely related to: bisq-network#350 bisq-network#2135 bisq-network#2509 bisq-network#3128 bisq-network#3307 bisq-network#3308 bisq-network#3343
bisq-network#3430 bisq-network#3657 bisq-network#3677 bisq-network#3683 bisq-network#3686 bisq-network#3786 bisq-network#3787 bisq-network#3892 bisq-network#3917 bisq-network#3918 bisq-network#3936

build.gradle

@@ -47,7 +47,7 @@ configure(subprojects) {
         httpcoreVersion = '4.4.13'
         ioVersion = '2.6'
         jacksonVersion = '2.8.10'
-        javafxVersion = '11.0.2'
+        javafxVersion = '14'
         javaxAnnotationVersion = '1.2'
         jcsvVersion = '1.4.0'
         jetbrainsAnnotationsVersion = '13.0'

desktop/src/main/java/bisq/desktop/app/BisqAppMain.java

@@ -129,5 +129,10 @@ protected void startApplication() {
     @Override
     protected void onApplicationStarted() {
         super.onApplicationStarted();
+
+        // Relevant to have this in the logs, for support cases
+        // This can only be called after JavaFX is initialized, otherwise the version logged will be null
+        // Therefore, calling this as part of onApplicationStarted()
+        log.info("Using JavaFX {}", System.getProperty("javafx.version"));
     }
 }