[bisq-network/bisq] Upgrade JavaFX to v15 (#4242)

[Christoph Atteneder]

@cd2357 I did a first test running JDK 11.0.8 on macOS 10.15.6 and the dmg binary was built successfully and I was able to start the app 👍 . But when clicking around I got a NPE quite quickly
```
Sep.-23 16:58:14.230 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: Uncaught Exception from thread JavaFX Application Thread 
Sep.-23 16:58:14.231 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: throwableMessage= Cannot invoke "javafx.scene.Node.getLayoutBounds()" because "this.textNode" is null 
Sep.-23 16:58:14.231 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: throwableClass= class java.lang.NullPointerException 
Sep.-23 16:58:14.232 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: Stack trace:
java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getLayoutBounds()" because "this.textNode" is null
	at bisq.desktop.components.JFXTextFieldSkinBisqStyle.updateTextPos(JFXTextFieldSkinBisqStyle.java:95)
	at bisq.desktop.components.JFXTextFieldSkinBisqStyle.layoutChildren(JFXTextFieldSkinBisqStyle.java:79)
	at javafx.scene.control.Control.layoutChildren(Control.java:601)
	at javafx.scene.Parent.layout(Parent.java:1207)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Parent.layout(Parent.java:1214)
	at javafx.scene.Scene.doLayoutPass(Scene.java:576)
	at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2476)
	at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:413)
	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
	at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:412)
	at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:439)
	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:563)
	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:543)
	at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:536)
	at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:342)
	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
```
This might be related to what @ghubstan was referring to in https://github.com/bisq-network/bisq/pull/4242#issuecomment-693473302. Maybe a next step would be to update the JFoenix library and trying to fix the open issues that we saw in the JFoenix update PR. I can try to help out there as good as possible.

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