Move the class out of weld.hxx into its own header, 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: Ie54aef229609f131d3d53874c9390339566880f3 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/196947 Tested-by: Jenkins Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>