-Required addition of an extra texture overlay for list headers, as normal button overlay is used for sort arrows.
-Added padding to italic text in scroll list, as the text clipped outside of the element.
-Groups list is now sortable and has header visible.
-'none' entry always be first in the list, regardless of sort order.
-LLGroupMgrGroupData::mListInProfile removed. Was unreferenced and always false. LLGroupMgrGroupData doesn't handle show/chat/notify properties
