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: I605656bc98a64640a78d2ff4de9c7c37326033cf
Reviewed-on: https://gerrit.libreoffice.org/62264
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>