Dedicated class for WebSocket Errors

[tresf]

Closes #937

Still in draft form, the class is just a proof of concept.

TODO:

• Return error numbers to JavaScript
  • @bberenz I think I'll need some help with this.
• Migrate existing errors to only allow new class
• Add query support for getting an exhaustive listing

[tresf]

@bberenz can you help with the way we're throwing the DeviceException up the stack? The error clearly states that the "USB Device cannot be claimed", which should be reasonable to catch, but instead it throws it all the way up to the socket enum, causing a general error.