Initial working 2.0.0 code

I have done a complete rewrite of Loadout because I finally have time
for it, hurray for hollidays! Now, Loadout uses the new SKSE
functionality that allows plugins to recognize small differences in
items better. Items with the same base item but a different name will
now be correctly distinguished from eachother. If you have a mod that
allows you to wear multiple similar items such as rings there might be a
small bug that causes Loadout to fail unequipping those items correctly.
This currently cannot be fixed without further help of SKSE. It is
extremely unlikely that it will affect your gameplay because if you can
equip multiple items, you probably will! With the rewrite I have
introduced some small optimizations.

I have changed the bind loadout hotkey modifier to CTRL instead of ALT
because I wanted to be able to switch loadouts in combat where I have to
use ALT in order to run. Since sneaking is toggled, in contrast with
running which is done by holding, you can still switch loadouts while
sneaking without accidentally saving a loadout.