some vtest fixes

wrong pitch of two notes in noteheadposition-1.mscz,
2 accidentals and 3 segnos too much in emmentaler-1.mscz,
wrong position of two articulations in emmentaler-3.png,
wrong trills in emmentaler-8,
wrong position of two articulations in bravura-5-ref.png
and SMuFL 0.9 noteheads for slash semibreve in bravura-10

Also adding Windows batch file to generate the -ref.png files
Merge pull request #846 from Jojo-Schmitz/vtest-fixes

some vtest fixes