audio/kid3: Update to 3.9.2; flavorize
Convert to FLAVORS with qt5 set as the default
- audio/kid3-qt5 -> audio/kid3@qt5
- audio/kid3-kf5 -> audio/kid3@kf5
- Add Qt6 flavor audio/kid3@qt6
audio/kid3-*: Update to 3.7.0
- Clean up Makefile after removal of kde4 and qt4 variants
- Remove PHONON option which was only for the qt4 variant
- Further simplify substitutions in pkg-plist