@Override
	public VTMarkupItemApplyActionType getActionType() {
		return VTMarkupItemApplyActionType.REPLACE_FIRST_ONLY;
	}
Constructor for action to only replace the first item (i.e. defined data at the 
destination address, but don't replace if other defined data beyond the destination 
address would be overwritten.)
@param controller the version tracking session controller
@param addToToolbar true indicates this action's icon should be added to the 
window provider's toolbar.
Ghidra/Features/VersionTracking/src/main/java/ghidra/feature/vt/gui/actions/ReplaceFirstMarkupItemAction.java