Solidity Natspec multiline /** .. */ comments

- Natspec now works with `/** ... */` type of comments.
- Some work on better formatting of the extracted text, especially on the multiline comments case
- Adding CR ('\r') as whitespace in the scanner
- Some tests
It's used inside a switch. Can't do it there. Only other chance is inside the while , 1 line under it but I really don't see the difference.