To make special newlines more explicit and visible.
Mostly in `<protocol>` sections, some in `<data*>` and `<upload>`.
Reducing the number of `tests/data/test*`:
- CRLF newlines from 21535 to 11337.
- files with mixed newlines from 1335 to 707.
Also delete empty `<protocol>` sections.
Closes#19284
This was spotted by Debian's lintian tool. It adds an informational
warning at every run, so my OCD was kicking in and I had to fix it :-)
Closes#17787
