Add vehicle graph core: .vhg loader, logic and cab blocks, -graph-run and -graph-catalog

vehicle/graph/graph_standalone.h

@@ -0,0 +1,24 @@
+/*
+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/.
+*/
+
+#pragma once
+
+#include <string>
+
+namespace vgraph
+{
+
+// -graph-catalog [<file.json>]: writes the description of all block types, for the external editor.
+// returns: 0 on success, 1 otherwise
+int graph_catalog_standalone(std::string const &Output);
+// -graph-run <file.vhg> [options]: checks the graph and runs it without the simulator, driven by a script of events.
+// returns: 0 on success, 1 otherwise
+int graph_run_standalone(int Argc, char *Argv[]);
+
+} // namespace vgraph