[FEATURE] Check for required programs at wahooMapsCreator start

[treee111]

This PR…

• check for relevant separate programs or content of python package / repo
  • macOS/Linux programs need to be installed in advance
  • Windows Programs should be included in the python package / repo
• closes #89

Considerations and implementations

How to test

1. start wahooMapsCreator via CLI in VSCode
2. start wahooMapsCreator via GUI in VSCode
3. start wahooMapsCreator via CLI installed via PyPI - version 2.1.0a2
4. start wahooMapsCreator via GUI installed via PyPI - version 2.1.0a2

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