Custom-Cookie-Cutter-Generator Usability Mods

I love the Custom-Cookie-Cutter-Generator made by Guru, but I found it was rather difficult to use, especially when trying to add / remove nodes. So, I made some usability changes:

* Current selected node is highlighted in red
* When moving a node, it picks the node closest to the mouse, not just ones that are 4px away
* Increased the height / depth of the cutting part for thicker rolls of dough
* New nodes are now placed at the mouse cursor in a logical clockwise order instead of at a sem