Again, many things were done in this commit such as implementing an
I/O queue, a mutex_queue, and implementing the hidpp::Report class.
I'm expecting commits to be like this until I can get a clean
codebase for the backend.
Multiple things have been done in this commit; the base of the new
backend has effectively been created. This branch currently has many
vital parts commented out. Therefore, this branch is currently only
intended for debugging.
