Rework internal module registration to happen in constructors.

src/modules/window/Window.h

@@ -131,9 +131,6 @@ public:
 
 	virtual ~Window();
 
-	// Implements Module.
-	virtual ModuleType getModuleType() const { return M_WINDOW; }
-
 	virtual void setGraphics(graphics::Graphics *graphics) = 0;
 
 	virtual bool setWindow(int width = 800, int height = 600, WindowSettings *settings = nullptr) = 0;
@@ -239,6 +236,10 @@ public:
 	static bool getConstant(DisplayOrientation in, const char *&out);
 	static std::vector<std::string> getConstants(DisplayOrientation);
 
+protected:
+
+	Window(const char *name);
+
 private:
 
 	static StringMap<Setting, SETTING_MAX_ENUM>::Entry settingEntries[];