JDI: add the 3 fills to the adjustments panel.

I am wondering why the adjustments panel does not also host the 3 kinds of fill layers, Solid Color, Gradient, or Pattern. it could be useful for graphic tablet users to be able to add a fill layer that way, using the same workflow: if there is a selection or a path, it is used to affect the adjustment layer. There's plenty of room in that panel for 3 more icons.