(Linux) Running status probably breaks when multiple devices are connected and sending messages simultaneously

[Nytra]

managed-midi/Commons.Music.Midi.Shared/SMF.cs

Line 312 in 98e269a

private static byte runningStatus;

I haven't tested this but I'm fairly sure multiple devices would fight over the running status byte currently

Making this use the [ThreadStatic] attribute might fix it

It's not a problem on Windows because every message is sent with a status byte in that case