Further work on new "text search" button. - Now allows to browse items (mouse, arrow key) - Assigns active value - Uses different backdrop to distinguish from popup menus - Cleaned API for it, so it can be used nicely generic Also added a search menu, which shows all currently working operators: CTRL+ALT+F. (mind the looks, it needs some tweaks!) To make a menu activating a button I've added a new event... could use some tweaks. Important note: the callback to pass on "old string" for text button (bone rename) couldn't work yet, added first code for new callback, but has to be worked on further. When bone rename gets added it can be tested.