Update orcus to 0.13.3 and make necessary adjustments.

Update orcus to 0.13.3 and make necessary adjustments.

This is a collection of the following:

(cherry picked from commit 20945a9a4de6684010fd5b3603595e6da543807d)
(cherry picked from commit a1c36eff089c3cd695bd78090575ca1c7677121e)
(cherry picked from commit 45a4e70484e7d90dab07a677914ada2d948b415c)

with all necessary changes to resolve conflicts & preserve correct
handling of font and cell background color imports.

Change-Id: I08eb3495adf74858bb23a84245a9923ebe2a13e2
Reviewed-on: https://gerrit.libreoffice.org/50213
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Gbp-Pq: Name orcus-0.13.3.diff