Update 0.4.0 - preview 4

Hey! I know that work on the app has been slow recently. Other life stuff took priority. I squeezed in 2 changes - not groundbreaking by any means, but nice nevertheless :)

• Added a new die shape, "Round D4".
• Fixed a bug in SVG import where system's locale dictated float parsing behavior and a SVG's viewBox could be badly interpreted, resulting in broken or tiny images.