This allows the headers in that folder to stand on their own and
not depend on any transitively included headers. All changes to
other files are needed to fix compiler errors related to missing
includes that occurred afterwards.

Change-Id: I2083b30763f0b2c1aacdff00226e5f567ae52db4
Reviewed-on: https://gerrit.libreoffice.org/24355Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>