All System.Timers.Timer's created duplicate after each hot reload

[srb2thepast]

An alternative well performing class is needed, preferably one that's already in the osu!framework.

[srb2thepast]

Fixed (hopefully temporarily) by returning if there is more than one ScoreImporter initalization.

[srb2thepast]

NVM now that implementation freezes the cursor each time it runs.... should really use something from o!f.