Fixed SMuFL anchors

[cbjeukendrup]

Resolves:

• [MU4 Issue] [Engraving] Note stems don't take the SMuFL anchors "stemUpNW" and "stemDownSW" into account #8952 (comment) (only @oktophonie's comment, not yet the whole issue)
• https://trello.com/c/86Ks7zZX/58-stemdownnw-stemupse-not-honoured-for-x-notehead

While working on #8952, I wrote some extra drawing code for debugging bboxes, positioning, anchors etc.. This revealed that the SMuFL anchors were hardly ever in the correct place, so stems were not attached correctly to noteheads. They always seemed to be at 80% of their correct position from the origin. And exactly that was the case. Now it looks like this:

(red + means origin of element; orange + is flag anchor point; yellow + is notehead anchor point; the green rect is the bounding box. Please don't mind the badly-placed and purple-coloured stems in this picture.)

Here is it without those extra things:

It also turned out that the metadata file for Petaluma was not added to the application, so for Petaluma the anchors did not work at all. That's fixed too with this PR.

[Jojo-Schmitz]

What puzzles me is that there are no vtest differences reported? There should be some minor ones (but for the better)

[cbjeukendrup]

What puzzles me is that there are no vtest differences reported? There should be some minor ones (but for the better)

That makes me a little worried too, also because I remember a PR of yours for which we also expected vtest differences but there wasn't. Makes me wonder whether the vtests are working at all...

[Jojo-Schmitz]

Yes, #8853. Something about the vtests seems severly broken

[cbjeukendrup]

It probably starts going wrong because the vtest input files are still old mscx files. It is unclear to me whether any output images are generated at all.

Then the compare step silently fails:

Run ./vtest/vtest.sh -c compare
MuseScore VTest
RUN_CMD: compare
SCORES_DIR: ./vtest/scores
ARTIFACTS_DIR: vtest.artifacts
MSCORE_BIN: build.debug/install/bin/mscore
DPI: 130
Compare PNG files and references
ls: cannot access 'vtest.artifacts/ref/*.ref.png': No such file or directory

Will try to fix it tomorrow.

[Jojo-Schmitz]

It is a separate issue though, not the business of this PR here. Which is good as it is, and should get merged sooner rather than later ;-)
See #8977.

BTW: thanks for splitting off the unrelated changes into a separate commit, helps understanding what this is about.