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

src/modules/keyboard/Keyboard.h

@@ -244,9 +244,11 @@ public:
 		KEY_MAX_ENUM = 512
 	};
 
-	Keyboard();
 	virtual ~Keyboard() {}
 
+	// Implements Module.
+	virtual ModuleType getModuleType() const { return M_KEYBOARD; }
+
 	/**
 	 * Sets whether repeat keypress events should be sent if a key is held down.
 	 * Does not affect text input events.