Removed hold.loc = usr hack from webbings code.

Got rid of the stupid hold.loc = usr hack. Now not necessary, as storage is refactored so that there is now an explicit proc for when a mob opens up a storage to view the contents. Removed the inaccessible if statement in /obj/item/weapon/storage/MouseDrop() (bad automerge?)
Updated subtypes of storage to use the new open() proc

Also got rid of /obj/item/weapon/storage/pill_bottle/MouseDrop(obj/over_object as obj). Not sure what it was doing differently.
Rustle sound now plays any time a storage is opened
Storage sound is now controlled by var

Realized the previously removed MouseDrop override for pill bottles was
to stop the rustle sound from playing.
Cleaned up reference to outdated proc

Removed references to outdated get_equipped_items(). Still one left.
Removed unnecessary override for belts.
Backpacks now play sound when un/equipped

They did this before, but that was due to all storage items playing
sound. Now only applies to backpacks.
Add internal storage type
Removed broken backpack unequipping sound
Fixed accidentally omitted call to parent
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.
Holsters and Unathi knife harness

Also fixed mistyped path and OnClick bug.
Fixed holster verb runtime
Merge pull request #4858 from mwerezak/webbing

Storage and Clothing/Accessory Changes and Cleanup