v0.6.0: Squashed commits from bencedit

Added

• Load bencode files
• Display Values
• Value::select() method
• Customizable ValueDisplay
• Show bytes left in repr_bytes()
• Bencode samples
• Value::traverse() method
• Value::len() method

Changed

• Limit stack depth in ValueDisplay
• Fixed empty dicts causing syntax errors
• Decrease stack count when popping containers in ValueDisplay
• Truncate long lists in ValueDisplay
• Dict iterators do not need to be peekable in ValueDisplay
• Use a builder pattern to change parameters in ValueDisplay
• Use container stacks with last/last_mut() instead of indexing
• Make dict keys Strings
• Make Value::select() and ValueDisplay::fmt() use Value::traverse()
• Fixed list remainder in ValueDisplay being off by 10. Turns out I was using the iterator to get the number of items.

Removed

• Ref variants from Value
• Debug prints