Easier Way to Annotate Graph with Data or Label in Worksheet and Project&Window Information

Add a button in Insert Variable dialog, which can hunt worksheet cell and then insert it:

1. The substitution text will be in the form of (n, @WT, col, row).
2. It supports both label area and data area.
   
   
   
3. Also support selecting data range.
    

In the Insert Variable Dialog, if the root folder(root node) of the worksheet(graph) on the right panel is selected, we are able to insert: 

1. Active Window Name //%H
2. Project Path //%X, only show when the project was saved once
3. Project Name //%G, only show when the project was saved once

into the graph or worksheet.

Worksheet insert variable dialog:

Graph insert variable dialog: