Add extra setProperty method in AppState

[NovuloFerdinand]

The AppState class has a method called setProperty:

ModernDocking/docking-single-app/src/io/github/andrewauclair/moderndocking/app/AppState.java

Lines 145 to 147 in b3c0507

	public static void setProperty(Dockable dockable, String propertyName, String value) {
	instance.setProperty(dockable, propertyName, new Property.StringProperty(propertyName, value));
	}

Could you add an overload that accepts a Property object, so different types of properties are supported?

[andrewauclair]

I can do that. I don't know why that method takes a String instead of a Property. AppState methods should match the signatures of AppStateAPI.