fix #25666: fix warning reg. ignored dllimport
Merge pull request #893 from Jojo-Schmitz/25666-link-under-windows

fix #25666: fix warnings reg. ignored dllimport
plugin access to small property for chords/rests
add plugin documentation for tpc1 and tpc2

and update the one for tpc
make the setSmall for chords/rests undoable