Removing or setting SMuFL glyph ID postfixes to a fixed string

[lpugin]

Discussed in #3552

^{Originally posted by craigsapp November 30, 2023}

Glyph IDs such as E566 have an added random postfix, such as srs021 in this case in the SVG output to verovio to avoid ID collisions when multiple verovio-generated svgs are placed in the same HTML document tree:

<symbol id="E566-srs021" viewBox="0 0 1000 1000" overflow="inherit">

Is there a way remove the random postfix, such as:

<symbol id="E566" viewBox="0 0 1000 1000" overflow="inherit">

or otherwise setting it to a user-selected string, such as

<symbol id="E566-my_postfix" viewBox="0 0 1000 1000" overflow="inherit">