[v0.9.0] Playlists & more

Features:

• &playlist - Robotto will now load playlists found in ./playlists. playlists have to be .txt files with alphanumerical names. Contains YouTube links seperated by line breaks (i.e. one link per line)
• &voteskip - You can now voteskip a song. Amount of votes required is the amount of listeners devided by two and rounded up.
• Added MasterDJ in Config - You can now determine MasterDJ users in the config file. Use a person's user ID. You can add multiple people in the array.

Fixes & updates:

• &skip now only works if the user is found in the MasterDJ array found in the config file.