Add script engine and connect to std console

src/openrct2/scripting/ScriptEngine.h

@@ -0,0 +1,45 @@
+/*****************************************************************************
+ * Copyright (c) 2014-2018 OpenRCT2 developers
+ *
+ * For a complete list of all authors, please refer to contributors.md
+ * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
+ *
+ * OpenRCT2 is licensed under the GNU General Public License version 3.
+ *****************************************************************************/
+
+#pragma once
+
+#include "../common.h"
+#include <future>
+#include <queue>
+#include <string>
+
+struct duk_hthread;
+typedef struct duk_hthread duk_context;
+
+class InteractiveConsole;
+
+namespace OpenRCT2
+{
+    interface IPlatformEnvironment;
+}
+
+namespace OpenRCT2::Scripting
+{
+    class ScriptEngine
+    {
+    private:
+        InteractiveConsole& _console;
+        IPlatformEnvironment& _env;
+        duk_context * _context;
+        std::queue<std::tuple<std::promise<void>, std::string>> _evalQueue;
+
+    public:
+        ScriptEngine(InteractiveConsole& console, IPlatformEnvironment& env);
+        ScriptEngine(ScriptEngine&&) = delete;
+        ~ScriptEngine();
+
+        void Update();
+        std::future<void> Eval(const std::string &s);
+    };
+}