Effect maker: Saving effect should save display names of the properties

Property display names are not exported when effect is saved in library. This results in properties displaying their actual property name in effect maker view instead of more readable display name they originally had, when you open the saved .qep file later. 

• Add effect node
• Note the property names
• Click "Save in library"
• Doubleclick on generated .qep in assets view
• Check the property labels

--> Displayed property labels will not match the initial labels