Also a few hxx files had missing headers and obsolete fw decls

Found with bin/find-unneeded-includes
Only removal proposals are dealt with here.

Change-Id: I9a35c566d30678af445da3fec9570af235afb353
Reviewed-on: https://gerrit.libreoffice.org/68131
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>