Moves shared helper scripts to the buildroot

buildroot/share/git/firstpush

buildroot/share/git/mfinfo

buildroot/share/git/mfnew

buildroot/share/git/mfpr

buildroot/share/git/mfprune

buildroot/share/git/mfrb

buildroot/share/git/mfup

buildroot/share/scripts/createSpeedLookupTable.py

buildroot/share/scripts/createTemperatureLookupMarlin.py

buildroot/share/scripts/findMissingTranslations.sh

buildroot/share/scripts/g29_auto.py