Hatch fill patterns plus Color & Invert

This is an update of Brian Katz's update to Ben Hinkle's original applypatch and makepatch code for replacing colors in figures with hatches as well as David's applypatch_plus. This new version allows you to either make a black and white hatch or use the colors of the fill to create colored hatches. Additionally you can invert the hatch, i.e. it is possible to have a blue hatch with white background or a white hatch with blue background. All of the previous work done in the plus addition should still work, just these are now new options. See help of functions for example usage.