Progress: Finish basic list content read changes.

Progress: Finish basic list content read changes.

I discovered that copying the file with the combining character at the start of the line (U+0301) causes a space to be added.
This is problematic and cost me some time.

I have to then manually recreate the file and use my `utf8` program to regenerate the correct test data:
```sh
utf8 -cB U+0301 >> test.txt
```

Fix some issues with the basic list content read code.
The start should be set to `begin` and not `0`.

Finish adding the combining and joiner code.

Consistently apply the `newline_last`.

The content can be found but when it ends of EOS or stop, then it is returning the EOS or stop status codes (`F_okay_eos` and `F_okay_stop`) without setting the found structure.
The code calling this should just need to check for `F_content_found`, so change the behavior to do this and set the found position when returning EOS or stop at the end.
The start of the function should return EOS or stop as usual.
I suspect this problem is likely also in the extended read and other such code.

Consistently break out of the loop so the exit handling code gets properly called before returning on error.