struct for URI representation fixes

New branch, changes to pull request #2257
1. Some methods removed.
2. Parsing algorithm changed from regexp to string slicing (by @s-ludwig)
3. proprety "auth" renamed to "userInfo"
4. Examples converted to documented unittests
If the return value of a property setter can't be provided basically for free - like here - it should probably be changed to a `void` return type.