Once ColorPicker is integrated in newTools

[Ducasse]

We should revisit the use of the method Morph>>changeColor

changeColor

	| dialog |
	dialog := ColorSelectorDialogWindow new
		title: 'Choose color';
		selectedColor: self color.
	dialog openModal.
	dialog cancelled
		ifFalse: [self fillStyle: dialog selectedColor]

It feels like we will need a colorPicker in Bloc.