- Added accordion tab title highlighting setter and title getter.
- Added filtered tabs title highlighting.
- Tabs which don't pass filter are hidden.
- Added applying filter on list refresh event to avoid refreshing list on every filter change.
- Moved part of LLTextUtil to llui/lluitextutil to reuse code in llaccordionctrltab.
- Fixed passing list size to mRefreshCompleteSignal.
- Added list refresh callback to LLInventoryItemsList for checking tab visibility  without re-applying filter sub-string.

Committed to proceed with dependent tasks.
If there are any comments/suggestions related to text utils this part of code may be changed without requiring much effort.

Reviewed by Mike Antipov at https://codereview.productengine.com/secondlife/r/363/

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branch : product-engine