update .gitignore

to match
http://musescore.org/en/developers-handbook/compilation/compile-instructions-windows-mingw-git
when using QtCreator
fix #24287
fix #24288
Merge pull request #644 from Jojo-Schmitz/24288-copyright-data

fix #24288
Merge pull request #643 from Jojo-Schmitz/24287-Perc-staff-type

fix #24287
Merge pull request #642 from Jojo-Schmitz/gitignore

update .gitignore
Merge pull request #641 from Jojo-Schmitz/orig_txt

fix #23366: one last(?) ommision