Move the class out of weld.hxx into its own header and source file, in order to make it easier to keep an overview and to avoid having to recompile ~all UI code when the class is modified. Change-Id: I6555d2343ec9b01d7915cd52508c0db4c8704509 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/196445 Tested-by: Jenkins Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>