Add support of M3U playlists for NSF/GBS/HES/etc... files

[Spaghetto392]

Description
When playing one of the above files, None of the tracks have names due to the file formats not supporting them. These files also tend to contain the SFX used in the games, which in some cases (e.g. Splatterhouse TG16) means long periods of random sound effects playing, should shuffle be enabled.

As a way to create a more enjoyable listening experience I suggest adding support for the M3U standard, as many of music/SFX bank downloads come bundled with them. M3U playlists remove the burden of digging through a large list of unnamed tracks. Furthermore, M3U files tend to specify the correct length for each track to play, which can help with tracks playing too long.

Additional information
While I am not personally aware of any other players that implement M3U files, given that they are commonly bundled with music banks, I would assume that it's a feature present on other players.