Detect load corrupt midi file

[ghost]

https://github.com/linthesia/linthesia/blob/main/src/libmidi/MidiTrack.cpp on line 40 it should be

if (header != MidiTrackHeader)
    throw MidiError(MidiError_BadTrackHeaderType)

Otherwise, the exception will not be caught in:

try {
     midi = new Midi(Midi::ReadFromFile(file_opt));
 }catch (const MidiError &e) {...}

Test file: https://github.com/jazz-soft/test-midi-files/blob/main/midi/test-non-midi-track.mid

[albfan]

Please, turn into a PR so you can be properly credited.