Use no break space to prevent reflowing of text

As originally mentioned in #51, there should be a way to prevent reflowing of certain text in specific cases.
For example, the string "chapter 3" or when there is a unit of measurement "25 m", it is desirable to prevent the number or unit being broken across a line break.

The no break space character `` `` (U+00a0) provides this functionality. Therefore propose that it may be used to prevent the separation of words across a line break.

Example:

``"for further information, see chapter 4."``

Example, a telephone number:
"Telephone 0123 4567."

However, see also #79 that the ordinary braille space character (U+2800) normally is not a word break character.