All note, measure etc. modifiers have these attributes. The SVG info is for the tracker to track the artifacts in the UI (mouse events, etc)

param ctor

  constructor name for deserialize

param logicalBox

  bounding box in SVG coordinates

param attr

  unique ID, simlar to vex object attrs field

### Hierarchy

- SmoModifierBase
  - GraceNoteParams

### Implemented by

- SmoMeasureModifierBase
- SmoNoteModifierBase
- SmoScoreModifierBase
- StaffModifierBase

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