Found with bin/find-unneeded-includes
Only removal proposals are dealt with here.
Cleaned directories are:
accessibility, drawinglayer, itemsetwrapper, main, sidebar

Change-Id: I612eae9dec636d57a3a3a00102d74b964da5b54c
Reviewed-on: https://gerrit.libreoffice.org/64307
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>