RubyPosition describes the position of the ruby text
relative to the base text. ABOVE and BELOW were defined
in ODF, while INTER_CHARACTER is originated from CSS
to indicate the alignment used in traditional Chinese.
For INTER_CHARACTER, the ruby text is aligned vertically
on the right side of the base text, disregard of the
writing mode is horizontal or vertical.

Change-Id: I89224704c192adf9ebb94024d0f2b03f00880cf5
Reviewed-on: https://gerrit.libreoffice.org/48326Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Jenkins <ci@libreoffice.org>