We currently get a really odd error message if we hit a problem processing audio files.

Ensure the file is a valid audio file and is not DRM protected

Allot of the time it has nothing to do with DRM. The underlying errors are ignored.
This commit reworks the error messaging to produce a error message which includes the actual error.

Also updated an error message that would give some weird error when using mp3/ogg with the WavImporter. We can do better there.

Fixed an bug in the launch.json so that we get a process list to pick the process we want to attach to. Very handy for debugging mgcb.