The changes are only shown in the editor and do not land in the final
commit message.
For that setting the git-commit-last-msg function and the commit-msg
hook had to be updated.
The function is now a standalone function instead of anonymous and
uses every line until the first comment in COMMIT_EDITMSG discarding the
new information too.
The hook breaks now when checking line lengths when the changes start
since for some weird reason they are passed together with the rest of
the message instead of being deleted like the comments.
Refactor commit-msg to reduce redundancies by splitting up the pattern
into the different 'levels'.
For the array the change from /bin/sh to /bin/bash was necessary.
Because of that: Change all `test` occurrences to [[ ]] for performance.
Refactor the script to match my coding style more and update the
comments.
When checking the filenames for non-ASCII characters, check also
renaming of files instead of only additions.
