Always create the GUI element but make it switchable via scripting

include/openspace/engine/gui.h

@@ -25,6 +25,8 @@
 #ifndef __GUI_H__
 #define __GUI_H__
 
+#include <openspace/scripting/scriptengine.h>
+
 #include <ghoul/glm.h>
 
 #include <map>
@@ -43,6 +45,11 @@ public:
 	GUI();
 	~GUI();
 
+	bool isEnabled() const;
+	void setEnabled(bool enabled);
+
+	void initialize();
+
 	void initializeGL();
 	void deinitializeGL();
 
@@ -56,9 +63,14 @@ public:
 	void startFrame(float deltaTime, const glm::vec2& windowSize, const glm::vec2& mousePos, bool mouseButtonsPressed[2]);
 	void endFrame();
 
+
+	static scripting::ScriptEngine::LuaLibrary luaLibrary();
+
 private:
 	void renderPropertyWindow();
 
+	bool _isEnabled;
+
 	std::set<properties::Property*> _boolProperties;
 	std::set<properties::Property*> _intProperties;
 	std::set<properties::Property*> _floatProperties;

include/openspace/engine/openspaceengine.h

@@ -29,7 +29,7 @@
 #include <openspace/interaction/luaconsole.h>
 #include <openspace/rendering/renderengine.h>
 #include <openspace/engine/configurationmanager.h>
-
+#include <openspace/engine/gui.h>
 #include <ghoul/cmdparser/commandlineparser.h>
 
 namespace openspace {
@@ -59,7 +59,7 @@ public:
 	scripting::ScriptEngine& scriptEngine();
 	LuaConsole& console();
 
-	GUI* gui() { return _gui; }
+	GUI& gui();
 
     // SGCT callbacks
     bool initializeGL();
@@ -97,7 +97,7 @@ private:
 	scripting::ScriptEngine _scriptEngine;
 	ghoul::cmdparser::CommandlineParser _commandlineParser;
 	LuaConsole _console;
-	GUI* _gui;
+	GUI _gui;
 
 	SyncBuffer* _syncBuffer;