This adds a way for the grammar checker extension to change color
and line type of the 'wiggly lines' LibreOffice uses to highlight
spelling or grammar errors.

Change-Id: Idd669cf362da34f8cfcdcec14f1f80df1ddb1f9e
Reviewed-on: https://gerrit.libreoffice.org/54927Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>