Revert "burncast: Add option to emit bell character"

This reverts commit 33357d86c51b423166d7d9ff55a1bcfe10af0504.

This was superfluous. It can be replaced by:

    $ ./burncast foo.mp3 && printf '\a'
Add twwatch.py

This adds the twwatch script, which helps me to browse Twitch more
quickly.
dict.cc.py: Switch to argparse

optparse was deprecated in 3.2 and is replaced by argparse.