Groove Agent SE: FLAC support

When you drag an audio event into Groove Agent that happens to be FLAC it gives an error message that it’s not a valid audio file. It would be more user friendly if any audio event is useable.

Older threads about this:
https://www.steinberg.net/forums/viewtopic.php?f=226&t=102850
https://www.steinberg.net/forums/viewtopic.php?f=226&t=105254