Fix --force, fix windows filename issue & introduce --ignore-write-errors

[TheDelta]

First of all thanks for this great project ❤️, it helped me with client.

I found a couple of issues and fixed them:

• --force is now working (missing variable)
• if a linux backup is extraced on windows, there could be the issue (which I faced) that some filenames are invalid.
  • for example somelog-00:00.log and the whole extract process would fail
  • therefore I added a filename & filepath fix for windows to remove invalid characters
• I also added a general --ignore-write-errors option in case there are some other issues.
  • This allows at least to get all other files except of the faulty ones

some trivial code refactoring and added .editorconfig