Update formatter config line tab (preview, limits)

The minimum amount of line breaks after a line comment must be >= 1,
else we could get invalid code.

Also updates the preview. Converted to java-ish "multi-line string" with

    xclip -o | while IFS='' read line; do echo '+ "'"${line//\"/\\\"}"'\n"'; done

(a bit more complex than in 551b132b because of nested quotes).
Fix formatter config maxLineLength

Similar to 30ce055, except with more problems that I don't quite
understand. (The last part was c.l.Integer vs j.l.Integer confusion,
and which one to use in setMaxLineLength().)
Fix formatter config spaceAfterParamListClosingParen

Different from 9d041de and 30ce055 because here, the int and the boolean
mean the same thing - the int is just a more precise way of expressing
it. So now we'll update the checkbox every time the int value changes,
and set the int value to the according end of the range (-80 / 80 -
somewhat arbitrary, but the true min / max values from ceylon.formatter
are way too big for normal use) every time the checkbox changes. So a 0
is saved as a 0, a -50 is saved as a -50, and an 80 is saved as 'true',
no matter if you arrived at it via number field or checkbox.