Stability function for chords

[oggy22]

For each chord have its stability value ready. Stability should range from 0% (augmented and diminished) to 100% (major and minor triads). These are possibly values:

Major triad      - stable=100%
Minor triad      - stable=100%
Major triad 7    - stable=80%
Minor triad 7    - stable=90%
Major triad 7maj - stable=90%
Minor triad 7maj - stable=80%
Sus2/4		 - stable=50%
diminished3	 - stable=10%
diminished4	 - stable=0%
Augmented        - stable=0%