Allow querying default soundfont properties
Allow querying default soundfont properties

Any attempts to modify it or its held objects will result in an
AL_INVALID_OPERATION error.

arkana-fts/openal-soft,aaronmjacobs/openal-soft,Wemersive/openal-soft,franklixuefei/openal-soft,arkana-fts/openal-soft,aaronmjacobs/openal-soft,franklixuefei/openal-soft,irungentoo/openal-soft-tox,alexxvk/openal-soft,BeamNG/openal-soft,BeamNG/openal-soft,Wemersive/openal-soft,irungentoo/openal-soft-tox,alexxvk/openal-soft