Added a perl directory for various perl scripts.

Added a music_tagger directory. Eventually I want to write some scripts that
make it easier to tag/make consistent meta data in mp3 files. This will expand
in the future when I have more time.

Also added a quick perl script that can shift the times in srt files. I'm tired
of having srt files that are slightly on the wrong time and wrestling with
video player to try and add/remove subtitle delay.
Removing this because it was moved to the perl/subtitles directory