v3.4.0 RIFF File Support

Happy Fourth of July!

New Features / Fixes

• Support for RIFF files (spans a lot of different codecs, but is generally the AVI, WAV, and DIVX containers)
• CombinedTag objects return default values to match behavior of the Tag base class
  • 0 for integer numeric properties
  • NaN for floating point properties

Probably Not Breaking Changes

• Updated to v4.1 of TypeScript, though this shouldn't cause too many issues