Add inversion mode to chord quiz

[j-vb]

The chord quiz could benefit from having a setting where chord inversions are explicitly tested. Currently, any inversion will work for every chord, but it would be a nice addition to train inversions specifically.

[ArTiSTiX]

Hello @j-vb
Sorry i let MIDI Jar development aside for some months.
I have this features in my mind already, but i still have issues working on MIDI Jar again.
I'll try to keep in touch with this.

[ArTiSTiX]

Hello, this is my top 2 priority, I’ll try my best to keep you updated as I’m trying to get back to developing MIDI Jar features.

[j-vb]

Hello @ArTiSTiX

Thank you for the reply, and I'm glad to hear that you've found time for MIDI Jar. I'm looking forward to future improvements!