Introduce option to change space between dynamics and expression text

Your idea

Introduce option to allow the user to change the default spacing between a dynamic and expression text snapped to it. This should be overridable per instance, as ideal spacing is context-dependent.

Note that with default settings (if dynamic and expression text styles are identical) there should be no visible difference between e.g. a dynamic with a (dynamic) text suffix, and a dynamic with snapped expression text. This will of course no longer be true if the user changes dynamic-expression text spacing, as dynamic-dynamic text spacing will still use the typographical space and will therefore be unaffected.

Problem to be solved

Prior art

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Additional context

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