Replace DefaultFormBuilder with a grid pane

The whole form is now rendered in JavaFX.
For now, all controls are displayed as a combination of a label and a textfield.
Add JavaFX version of PropertyBean, PropertyAction, and IPropertyFXControl
Add test for OptionPanel's form panel

The test is a way to check the various JavaFX version's of PropertyBean
subclasses without having to reload the entire application.
Add JavaFX version of BooleanProperty
Add JavaFX version of ColorProperty

A JavaFX update of ColorUtils was added in order
to be able to convert JavaFX's Color to String, and vice versa.
Add JavaFX version of ComboProperty
Add JavaFX version of FontProperty