New Feature & Bug Fixes

I added the ability to insert incrementing numbers at the selections. It takes advantage of the delta values to insert numbers incrementing by 1, 10, 100 (or whatever the user's settings are).
Note: I kept the same shortcut formats, but with the Insert key. I'm not sure what this maps to on OSX.

I also fixed a typo in the settings comments and stopped it from auto-saving on every selection iteration. It will only save it once, after the loop.