Created class for History
Default settings for history
Defined data structures
Defined data structures 2
Actions Undo and Redo
implementing undo and redo slots
Adding node undo OK
Adding link undo OK
Implementing undo redo
Fixed link repainting
Fixed link color and tickness saving
Fixed bugs
Fixed automatic resizing
Properties panel minimize
New history types
TextColor and LineColor undo OK
Line editing undoing OK