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: #350 #2135 #2509 #3128 #3307 #3308 #3343
#3430 #3657 #3677 #3683 #3686 #3786 #3787 #3892 #3917 #3918 #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 @@ public class BisqAppMain extends BisqExecutable {
     @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"));
     }
 }