Previously there were only the fieldmark-start and fieldmark-end
elements; now add a fieldmark-separator, so that the field command can
be stored as character data (and elements if there is any formatting)
instead of attribute value.
The import is a bit more complicated because there are already existing
documents that are missing the separator; it's not possible to predict
if there will be a separator at the time when the start element is seen,
so add some hack to toggle inserting the SwXFieldmark with separator
at the end (when the document contains a separator, i.e. after the
command) or separator at the start (when the document is missing a
separator, i.e. after the result).
Change-Id: I14d2f50f57d690e75643df5d14fd881ebc759a41
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/136513
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
