Allows Ctrl-A to select all in a list (Like for selecting all groups and unticking chat with a single click)
Ctrl-E to deselect
Ctrl-X/Ctrl-C to copy a list (useful for saving ban lists and such!)
Updates llfloatergroups to be a lot similar to upstream
- Adds LLFLoaterGroupPicker::removeNoneOption and changes LLFloaterGroupPicker to use modern style callback
- Switched from using per ui xml string for the none entry in groups to the strings.xml one, updated and cleaned existing translations to use this.
- Changes LLFLoaterGroupPicker into an instance tracker by id, because it was already acting like one.
Updates llpanelpermissions RLVa bits and fixes last owner label never enabled
-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
