Class: Playlist

Attributes:
SongAmount (integer)
PlayLength (float)
SongLength (hash)
PlaylistCreator (string)
PlaylistTitle (string)
SongPlays (hash)

Methods:
AverageSongLength (divides PlayLength by SongAmount)
AverageSongsPerHour (divides 60 by AverageSongLength)
AddSong (increases SongAmount, increases PlayLength, modifies SongLength)
RemoveSong (decreases SongAmount, decreases PlayLength, modifies SongLength)
ChangePlaylistTitle (modifies PlaylistTitle)