Notepad window to help organise multiple features

NOTEthis is a very short place holder for notes TBD

Motivation

There are a number of circumstances when annotators wsih to do things with groups of features eg:

and it is proposed to provied a notepad window where lists of features may be assembled in multiple tabs and actions performed on them via a drop down menu. For example the current stack of hidden items that is driven by focus/select and keystroke could be replaced by a dialog with visible lists of feature names, and these could be selected for show or hide in any order, providing enhanced function with a more explicit user interface.