Update Sizes and FormFactors on NewPart tool

I changed the size of newly created spawns and wedges from the default 4, 1.2, 2 to 4, 1, 2 (see lines 86 and 101). I also added "NewPart.FormFactor = "Custom";" to all the types (see line 104). These changes will allow for more seamless building, and will allow all of the parts to be on the same playing field, per se. Please consider these changes.