Sc 107/default extention file selection
What's new:
- Automatically goes to the correct dir, depending if you look for shadows or source files!
- Has .csv as default instead of .txt
- Added .TextGrid as option
- Title of file selection window dependent on whether you look for source or shadow files
- File selection function has no code duplication anymore
- Layout of code in some other files is fixed to meet PEP standards