No Leaking When Disconnecting

- Dispose of Myos when they are disconnected. We no longer need to manage disconnected Myos.
Pose Refactor

- Moved poses into their own namespace.
- Create an interface for the pose sequence... Not a huge fan of the constructors throwing exceptions (IMO, it's too late to be checking that kind of stuff) but if we want to allow people to inherit from them, I feel like we might want to go this route...
- Pose sequences use a static Create() method now and only return back an interface.
- Added a bit more for doc comments.