Address all fixed-shape symbols

[hbitteur]

As opposed to say beams or slurs which can largely vary in size, the so-called "fixed-shape" symbols are rather stable in shape and size, with respect to the related staff height.
For the full-context classifier to work correctly, we need to make sure that all these fixed-shape symbols can be provided via MuseScore generation.

We have to validate each shape listed in OmrShape class