* Gears Version 2.3

* Major refractor - removed most of the hardcoded stuff.
* Separated functions into gear, worm gear (and experimental/non-working spokes)
* "Gear" now doesn't have any duplicate vartices.
* New submenu "Gears" (entries "Gear" and "Worm Gear")
* TODO: Prevent doubles in "Worm Gear" (change it so only one row of verts is calculated for each step)
* TODO: Finish/improve spokes code ("add_spokes").
* TODO: Create new "auto-spokes" function that addes a "Gear Spokes" Object for an existing "Gears" obj (either via the "recall" data - this stuff is usefull :-) or by creating 2 objects at the same time.)