User text style compatibility with 2.x
Some scores, such as this OpenScore score have more user text styles than are supported in MuseScore 3 (i.e. more than 6).
I suggest, when reading 206 scores, we read these extra styles temporarily, then go through every element that is affected by these styles and apply the values that the style sets for them. This way 2.x scores will look more like they should, but we don't have to go through the hassle of adding more user text styles.
I can implement this if this seems like an OK idea?