Score testing

Unreadable Score extension output in dark mode

Hopefully I can get the Score extension working to produce SVG output, instead of the transparent PNG image that needs a white background styling for dark mode otherwise it's unreadable.

Examples

Range of the contrabass trombone, as used on Wikipedia:

Unable to compile LilyPond input file:

The Spear motif from Das Rheingold:

Unable to compile LilyPond input file: