[bisq-network/bisq] Feature: Add "Don't show again flag" for systray warnings (#4691)

[Přemek Vyhnal]

I have the same warning showing up every time my laptop locks the screen after inactivity. 
I'm on Gnome 3.38.0

The exception in the log is as follows.
```
Dec-01 01:24:40.490 [AWT-EventQueue-0] ERROR b.c.s.CommonSetup: Uncaught Exception from thread AWT-EventQueue-0 
Dec-01 01:24:40.490 [AWT-EventQueue-0] ERROR b.c.s.CommonSetup: throwableMessage= The system tray is not supported on the current platform. 
Dec-01 01:24:40.490 [AWT-EventQueue-0] ERROR b.c.s.CommonSetup: throwableClass= class java.lang.UnsupportedOperationException 
Dec-01 01:24:40.490 [AWT-EventQueue-0] ERROR b.c.s.CommonSetup: Stack trace:
java.lang.UnsupportedOperationException: The system tray is not supported on the current platform.
	at java.desktop/java.awt.SystemTray.getSystemTray(SystemTray.java:188)
	at java.desktop/sun.awt.X11.XTrayIconPeer$4$1.run(XTrayIconPeer.java:222)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
	at java.desktop/java.awt.EventQueue.access$600(EventQueue.java:97)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
```
Note the empty space in the top right corner where the icon should probably be, i can rightclick there but the icon is in the top left corner (not active).

![Screenshot from 2020-12-01 09-56-46](https://user-images.githubusercontent.com/1145361/100718720-f22f0200-33bb-11eb-8541-668777b5cb79.png)


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