Add underline style font

[lcaouen]

Add the underline style font to some widgets.

List of the widgets concerned by this PR :

• ActionButtonRepresentation
• BaseLEDRepresentation
• BoolButtonRepresentation
• CheckBoxRepresentation
• ChoiceButtonRepresentation
• LabelRepresentation
• RadioRepresentation
• SlideButtonRepresentation
• TextSymbolRepresentation
• TextUpdateRepresentation

Testing has been done manually by checking the widgets in a bob file.

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[georgweiss]

I think this looks OK.
@shroffk, any reason to not merge?

[georgweiss]

@lcaouen, I spotted a potential issue...

If a display where a widget has selected one of the new styles is loaded into a version of Phoebus where this is not supported, the editor will show an error dialog and the widget will be highlighted as problematic, see below.

Maybe we should consider a fallback, i.e. if the style cannot be found, fallback to WidgetFontStyle.REGULAR, and maybe just log the problem.

java.lang.IllegalArgumentException: No enum constant org.csstudio.display.builder.model.properties.WidgetFontStyle.
	at java.base/java.lang.Enum.valueOf(Enum.java:293)
	at org.csstudio.display.builder.model.properties.WidgetFontStyle.valueOf(WidgetFontStyle.java:15)
	at org.csstudio.display.builder.model.properties.FontWidgetProperty.readFromXML(FontWidgetProperty.java:102)
	at org.csstudio.display.builder.model.WidgetConfigurator.configureAllPropertiesFromMatchingXML(WidgetConfigurator.java:136)
	at org.csstudio.display.builder.model.WidgetConfigurator.configureFromXML(WidgetConfigurator.java:104)
	at org.csstudio.display.builder.model.widgets.ActionButtonWidget$ActionButtonConfigurator.configureFromXML(ActionButtonWidget.java:181)
	at org.csstudio.display.builder.model.persist.ModelReader.createWidget(ModelReader.java:326)
	at org.csstudio.display.builder.model.persist.ModelReader.readWidget(ModelReader.java:298)

[shroffk]

Maybe we should consider a fallback, i.e. if the style cannot be found, fallback to WidgetFontStyle.REGULAR, and maybe just log the problem.

+1
I think we should add the fallback

Other than that I think this is a good addition