pch migration to modules [wip]

simcore/simcore.cppm

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+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+// Primary interface unit for the simulation core. It only re-exports the
+// partitions; every declaration still lives in the file it always lived in.
+// These pieces reference each other in both directions, so C++20 modules require
+// them to share a module -- see :fwd for why.
+
+export module eu07.simcore;
+
+export import :fwd;
+export import :mover;
+export import :model3d;
+export import :animmodel;
+export import :scenenode;
+export import :scene;
+export import :event;
+export import :memcell;
+export import :evlaunch;
+export import :segment;
+export import :trkfoll;
+export import :track;
+export import :traction;
+export import :driver;
+export import :aircoupler;
+export import :button;
+export import :tractionpower;
+export import :dynobj;
+export import :editoruipanels;
+export import :editoruilayer;