More sensible clothing w_class

Helmets, suits, shoes, and large articles of clothing now have a more
appropriate w_class = 3. Slippers are small enough to have w_class = 2.
Fixed hats not being pocketable

Made shoes pocketable again too, why not.
Fixed internal storage, added coat pockets

/mob/proc/ClickOn() now checks storage levels, not just contents levels,
now allows items to be taken out of internal storage attached to another
item.
Coats now use internal storage for their pocket slots, removed duplicate
storage code.
Moved coat.dm out of it's special folder and into modules/clothing.
Webbings now use internal storage

Clothing no longer manipulates webbing members for better encapsulation.
Instead attackby() and attack_hand() are forwarded to accessories if
they are present.
Removed "Look in Storage" verb for less verb clutter.