Leading or trailing white space characters in file names

[Roland Melkert]

I don't see any valid reason for allowing leading and or trailing white spaces.

But if we do allow it, we need to think about introducing quotes as-well so parsers know where the start and end.

Backwards compatibility will break with quotes (in means of software failing to find the referenced file) but so does using leading/trailing white spaces.

Also when we declare leading and or trailing white spaces 'invalid' then we must also define exactly what 'white spaces' are.