Add funcs to music room

I want to add functions to MusicRoom.

    def MusicRoom.RandomPlay(self)
This starts playing the file chosen from unlocked_list.
This is used to show RandomPlay button on MusicRoom.

    def MusicRoom.TogglePlay(self)
This starts playing when the music room is playing.
Otherwise, stop the music.
And this is selected when the music room is playing.
This is used to show TogglePlay button on MusicRoom.