[findbugs] Double assignment of field Image.widthPx
[findbugs] add default: on switches
[findbugs] MaskValueBoxHelper remove unused field index
[findbugs] IconFont implement equals and hashCode
[findbugs] Modify static field from static method
[findbugs] InputFile remove unused variable
[findbugs] InputSlider call explicit parent method
[findbugs] CollapseHelper.toggleWidget unused : remove
[findbugs] factorisation de la method randomInt