In the past, weld.hxx used to contain the class
definitions for weld::Widget and all subclasses,
as well as a few helpers.
By now, weld::Widget and almost all subclasses have
been moved to separate headers, to make it easier
to keep the overview and to avoid having to
recompile ~all UI code when anything in weld.hxx
changes.
Move the weld::toId and weld::fromId helpers from
weld.hxx to weldutils.hxx, in preparation of getting
rid of weld.hxx altogether in an upcomcing commit.
Change-Id: I408fe20a74ff104cbfe07bde3105317a1922ff61
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/205936
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>