[FEAT] remove coding handling breaking changes and unused function

[treee111]

This PR…

• removes one unused function and
• removes the code of handling breaking changes

Considerations and implementations

Release v4.0.0 was released on May 5, 2023.
People who installed wahooMapsCreator before that date and update just now might have files in the user-maps and user-_download folder which are no longer accessed / used / deleted due to change of naming for country files

This also closes #251 / to not redownload files:

• The first thought was to save the version_last_run earlier, i.e. after downloading files but the the technology of checking for breaking changes and tacking care of them is somehow not the same as now.
• Then I thought to do nothing to tackle the issue because normally, version_last_run should be set if running successful for a small country/tile.
• In the end I watched at the location where deletion takes place - the check and handling of breaking changes. Since a user had to use wahooMapsCreator about more than a year ago and not update since then in combination with the small negative impact (files that are no longer accessed) brought the idea to delete the handling of breaking changes. Making room for possible breaking changes in the future ;-)

How to test

1. use wahooMapsCreator as normal - you should not notice and difference

Pull Request Checklist

• Reviewed the Contributing Guidelines
  • Especially the Pull-Requests section
• Commits (and commit-messages) are understandable
• Tested with macOS / Linux
• Tested with Windows