EXT-7158 FIXED Implemented showing of full outfit content if its name or any item(s) inside it match current filter.

- Added availability to force showing unmatched items to LLFlatListViewEx

- Applied it to wearable items lists in LLOutfitsList

- Changed condition for outfit accordion tab showing (because now all items are visible, so checking their number doesn't help).
Used here check for a flag added in this fix, which tells whether last applied filter found any matches in the list.

Reviewed by Neal Orman at https://codereview.productengine.com/secondlife/r/648/

--HG--
branch : product-engine