* Largely untested, introduces custom title attributes pulled from site APIs
Included is support for {title}, {category}/{game}, and {author}
for Twitch and Youtube
Only tested (briefly) for Python 3 + Linux.
Committing to test on other platforms (Windows)
* bug-fix 1
* bug-fix 2
changing to list2cmdline turns out to not be necessary, since subprocess.call has already disabled the ability to break out by using `shell=False`
also broke launching on windows.
* bug-fix 3
move this to the pi3 area
* allow user to escape $ with \$
in case the user wants to use format codes.
comes at the expense of allowing streamers to insert format codes
that only appear for streamlink users, but is not a security risk
