Updated the new module changes to use more compile/link-time checking rather than runtime checking.

src/modules/mouse/Mouse.h

@@ -49,9 +49,11 @@ public:
 		BUTTON_MAX_ENUM
 	};
 
-	Mouse();
 	virtual ~Mouse() {}
 
+	// Implements Module.
+	virtual ModuleType getModuleType() const { return M_MOUSE; }
+
 	virtual Cursor *newCursor(love::image::ImageData *data, int hotx, int hoty) = 0;
 	virtual Cursor *getSystemCursor(Cursor::SystemCursor cursortype) = 0;