Remember last selected song in song select

[flustix]

No description provided.

[marchc1]

ChartSong was meant to be an abstraction, and adding an Id property to it directly attached to MuseDashSong is not the move IMO.

If this could be done differently, that would be ideal. I will look into ideas for this.

[flustix]

Could probably also assign the ID on custom charts and make it by filename. There just wasn't anything to differentiate charts after restarting.

[marchc1]

Probably what would be best is if the song logic was separated similarly to how other descriptors are. In essence having a IChartProvider or something. Then you could be like "MuseDashChartProvider/ID HERE" maybe as the convar value. I'll think about the best way to do it.

The only question is how that would work for MDMC charts (probably it just shouldn't, and instead always start at the beginning)