+ introduce a separate LibO namespace for that

Change-Id: Ie62da0746e81ea0d861680863beb03094649d41c
Reviewed-on: https://gerrit.libreoffice.org/17216Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>