Misc. cleanups in Python scripts

• Remove -tt option for Python, irrelevant in Python 3,
• Clean up grand-replace.py, obviating pytt.py,
• Use os.path.relpath for relative.py instead of manual manipulation of paths,
• Simplify and inline string_to_integer from utilities.py.

added Maintainability Scripts labels

assigned to @jeanas

added Patchnew label

added 8 commits

• 6c6ae3f2 - grand-replace.py: use subprocess API to get file list from Git
• a1d14796 - grand-replace.py: use globbing patterns for excluded files
• 062648da - grand-replace.py: remove unused stuff
• ae9974bf - grand-replace.py: improve and fix parsing logic
• 9c0405ff - Remove scripts/build/pytt.py
• 23b62484 - Remove scripts/build/relative.py
• 4ffebdf6 - Python: simplify and inline string_to_integer()
• 45235bf1 - Remove scripts/auxiliar/readlink.py

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added 4 commits

• affe305a - Remove scripts/build/pytt.py
• 0046f3ad - Remove scripts/build/relative.py
• 31fea183 - Python: simplify and inline string_to_integer()
• 73e42586 - Remove scripts/auxiliar/readlink.py

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added 2 commits

• c4d105ab - Simplify scripts/build/relative.py
• 638c5383 - Python: simplify and inline string_to_integer()

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resolved all threads

added 2 commits

• d6aa8b29 - Simplify scripts/build/relative.py
• fedb201d - Python: simplify and inline string_to_integer()

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approved this merge request

Tests show no differences at https://lilypond.gitlab.io/-/lilypond/-/jobs/2463116141/artifacts/test-results/index.html.

added Patchreview label and removed Patchnew label

I'd also appreciate if you could put at least some form of summary, maybe with a list of concerned scripts?

added 6 commits

• 9b790b73 - grand-replace.py: use globbing patterns for excluded files
• 17a7f109 - grand-replace.py: remove unused stuff
• 91794f02 - grand-replace.py: improve and fix parsing logic
• ca514168 - Remove scripts/build/pytt.py
• da058f90 - Simplify scripts/build/relative.py
• b7cbbad2 - Python: simplify and inline string_to_integer()

Compare with previous version

added Patchnew label and removed Patchreview label

resolved all threads

changed the description

added Patchreview label and removed Patchnew label

added Patchcountdown label and removed Patchreview label