#### Axis_group_engraver

Group all objects created in this context in a VerticalAxisGroup spanner.

Properties (read)

`extraVerticalExtent` (pair of numbers)
  extra vertical extent, same format as minimumVerticalExtent
`minimumVerticalExtent` (pair of numbers)
  minimum vertical extent, same format as verticalExtent
`verticalExtent` (pair of numbers)
  Hard coded vertical extent. The format is a pair of dimensions, for example, this sets the sizes of a staff to 10 (5+5) staffspaces high.

                \set Staff.verticalExtent = #'(-5.0 . 5.0)

  This does not work for Voice or any other context that doesn't form a vertical group.

This engraver creates the following layout objects: VerticalAxisGroup.

`Axis_group_engraver` is part of contexts: DrumStaff, GregorianTranscriptionStaff, NoteNames, RhythmicStaff, Staff, TabStaff and VaticanaStaff

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