[bisq-network/bisq] Dark mode, flat UI, alignment fixes (#4121)

[wiz]

Also, here are the CSS errors from the log
```
Apr 06, 2020 4:27:53 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-bs-rd-nav-deselected' while resolving lookups for '-fx-fill' from rule '*.nav-button *.text' in stylesheet jar:file:/Applications/Bisq.app/Contents/Java/Bisq-1.2.9.jar!/bisq/desktop/bisq.css
Apr 06, 2020 4:27:53 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-bs-rd-nav-selected' while resolving lookups for '-fx-fill' from rule '*.nav-button:selected *.text' in stylesheet jar:file:/Applications/Bisq.app/Contents/Java/Bisq-1.2.9.jar!/bisq/desktop/bisq.css
Apr 06, 2020 4:27:54 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-bs-rd-nav-deselected' while resolving lookups for '-fx-fill' from rule '*.nav-button *.text' in stylesheet jar:file:/Applications/Bisq.app/Contents/Java/Bisq-1.2.9.jar!/bisq/desktop/bisq.css
Apr 06, 2020 4:27:54 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-bs-rd-nav-deselected' while resolving lookups for '-fx-fill' from rule '*.nav-button *.text' in stylesheet jar:file:/Applications/Bisq.app/Contents/Java/Bisq-1.2.9.jar!/bisq/desktop/bisq.css
Apr 06, 2020 4:27:54 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Could not resolve '-bs-rd-nav-selected' while resolving lookups for '-fx-fill' from rule '*.nav-button:selected *.text' in stylesheet jar:file:/Applications/Bisq.app/Contents/Java/Bisq-1.2.9.jar!/bisq/desktop/bisq.css
```

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