Semantic tweaks to iwDeliver functions
Semantic tweaks to iwDeliver functions

- returns IW_DELIVER_PRIM when no prims match link number
- returns IW_DELIVER_NONE when NO items are found to deliver
- multi-prim link numbers like LINK_SET will search until at least one
inventory item is found (then use that prim)
- all 6 inventory delivery functions factored to common code

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