[bisq-network/bisq] Remove awt dependencies (#5008)

[James Cox]

Related to #4940 

Replace usage of awt classes wherever possible with the JavaFX equivalents.

- Do not use system tray.
- Remove usages of `java.awt.Desktop` for opening URIs.  Use `openSystemSpecific()` instead.
- Remove usages of `java.awt.GraphicsEnvironment`.  Use `javafx.stage.Screen` instead.
- Detect MacOS retina display by `Screen.getPrimary().getOutputScaleX() > 1.5;`


----

To open a URI we take a convoluted path from `GUIUtil.openWebPage` (desktop) to `Utilities.openURI` (common) to `DesktopUtil.browse` (common).  What do you think about simplifying this by moving DesktopUtil from common to desktop?



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

  https://github.com/bisq-network/bisq/pull/5008

-- Commit Summary --

  * remove awt dependencies

-- File Changes --

    M common/src/main/java/bisq/common/util/DesktopUtil.java (106)
    M common/src/main/java/bisq/common/util/Utilities.java (35)
    M desktop/src/main/java/bisq/desktop/app/BisqApp.java (20)
    D desktop/src/main/java/bisq/desktop/app/SystemTray.java (162)
    M desktop/src/main/java/bisq/desktop/util/ImageUtil.java (12)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/5008.patch
https://github.com/bisq-network/bisq/pull/5008.diff

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