Carve must use a centralized Undo Stack
Carve should utilize the Undo framework in Qt (QUndoStack, QUndoCommand, etc) for all edits to the document. At the moment, Undo/Redo is provided through the QTextEdit in the Carve SVG child window, but this needs to be changed so that typing as well as other actions in the UI use a centralized Undo stack (this is critical to set up before we start adding the ability to edit the document outside the text editor).
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Target this for Carve Lithium (0.03).
After investigating this, I realized that there is a rationale for keeping everything in terms of 'changes to text'. Thus, all commands that you can do to a SVG document through Carve will be reduced down to text changes and applied to the text editor (thus, automatically making use of the QTextEdit's built-in Undo/Redo capabilities).
This has been completed in Build 13.
