additional patch for EXT-6732 Create specialized view of inventory for...

additional patch for EXT-6732 Create specialized view of inventory for "clothing" accordion tab of outfit editor

* reimplemented button bars as static panels not as list items (creating accordion - button bar - list view - adaptor/container)
* added management of items' buttons assording to inventory items' states
* assigned actions to clothing/bodyparts items' buttons
* got rid of separators as distinct items and made them as part of items
* removed ad-hoc up/down buttons
* removed "+" button from a button bar

Reviewed by Mike Antipov at https://codereview.productengine.com/secondlife/r/322

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branch : product-engine