Level Editor - Maintain proportions when resizing Art objects

[Master Raiden]

When you try to resize Art objects, you will often stretch it a little bit, making it slightly taller or slightly wider than intended.

I think the Level Editor should be enhanced to allow the height and width proportions of Art objects to be retained when resizing.

This will be helpful when:
• Resizing blocks in Art layers
• Resizing text
• Making Fred bigger without turning him into Fred the Fat Cactus