Added some features

Added features:
- Sorting returned items by their value
- Shows value of all your returned items
- A setting that changes the size of items since my biggest problem with this extension was that the items were too big. I couldn't really figure out how the resizing system worked so I just ended up overriding it if the setting was set.

By the way, this is my first time contributing to anything so let me know if I fucked something up!