Found with bin/find-unneeded-includes after recent improvements
- remove UNO headers from blacklist
- remove newly found unneeded fw declarations
- fix up some not self contained headers

Change-Id: Ib262e361b62162d96ce8308500b1a41a971353df
Reviewed-on: https://gerrit.libreoffice.org/62258
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>