Renamed variable parm to dtype to better define purpose on scripts/index.php and scripts/download.php.
Utilize var dtype to control logic for audio or video download on scripts/index.php and scripts/download.php.
Remove var dtype from youtube-dl call in scripts/download.php.
Initial commit to time shift audio files in scripts/download.php.
Adjust some notation and output on video time shift in scripts/download.php.