Improvement in Insert Variables dialog.

Support inserting variables from worksheet cell into text (only for graph)

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

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

Additional Info (%G, %X, %H) in Plot level for Insert Variable Dialog

In the Insert Variable Dialog, if the root node on the right panel is selected, we are now 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.

he dialog show a root node on right panel called Graph#-Layer#.
We can show these 3 nodes in info tab of Graph#-Layer#