Implemented low sub-task EXT-7164 (Implement preserving panel inventory item...

Implemented low sub-task EXT-7164 (Implement preserving panel inventory item selection across COF wearables lists updates (i.e. when changing ordering of wearables - up/down).)
- implemented preserving of current items selection during lists updates.
Reviewed by Mike Antipov at https://codereview.productengine.com/secondlife/r/344/

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branch : product-engine