- Moved wearable item name comparator from llcofwearables to llwearableitemslist.
- Added wearable item type comparator.
- Added item type and description getters to wearable item base class LLPanelInventoryListItemBase.

Reviewed by Mike Antipov at https://codereview.productengine.com/secondlife/r/407/

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branch : product-engine