Development for Issue #514

[crossrulz]

Development for Issue #514

• Created a History library and class to handle the undo/redo stack. The class is replacing the FGV_Undo Redo.vi.
• History.lvclass was added to IE Classes.ctl, which is included in Global Data.ctl. This caused many VI updates purely related to the use of Global Data.ctl.
• Moved Apply Body Text.vi and Add Data To History.vi to be called in the case structure with DrawIcon.vi. This makes it so that the icon text and adding to the undo/redo stack is performed after every action without the need to call them either directly or by creating an event.
• Replaced all other calls to Add Data To History.vi with Set Undo Flag.vi. This flag is used by the Add Data To History.vi to see if actions should be added to the undo stack. The flag is cleared in the Add Data To History.vi to avoid the flag being persistent.
• Removed all found Value(Signaling) property writes for the Body Text control. These were used to force the event that would draw the icon text, which often led to multiple undo states for a single action.
• Fixed bug where Clear All menu item was not clearing out the Icon Template layer control. Template layer was still being cleared in the icon data, just not the control.
• Updated unit tests related to the FGV_Undo Redo.vi to use History.lvclass instead. The tests were renamed accordingly. A unit test was added for testing the undo flag.