<commit_before>- Optimize audio streaming
- Add an empty RenderWindow constructor, to let the user delay the
  window creation
- Document the attribute types and explain them in the tutorial<commit_msg>Updated TODO.txt<commit_after>- Optimize audio streaming.

- Add an empty RenderWindow constructor, to let the user delay the
  window creation.

- Add in-place operator overloads in Time, and possibly in other
  classes that I forgot.

- Rename the module to sfml.

- Convert Unicode arguments to UTF-8, instead of requiring Python 3
  users to use byte literals all the time.
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