Conver Paragraph Alignment and Indent & Spacing to widget UI.

Change-Id: Ib3b7d76a63bd677d5d94f7385bbf589f18eceeda
Reviewed-on: https://gerrit.libreoffice.org/4047Reviewed-by: Olivier Hallot <olivier.hallot@edx.srv.br>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>