Removed constructor and destructor from static classes Keyboard and Mouse

Former-commit-id: 9c9054723b33535ec444bda4621dd678284d6983

include/Nazara/Utility/Keyboard.hpp

@@ -161,6 +161,9 @@ class NAZARA_API NzKeyboard
 			Count
 		};
 
+		NzKeyboard() = delete;
+		~NzKeyboard() = delete;
+
 		static NzString GetKeyName(Key key);
 		static bool IsKeyPressed(Key key);
 };

include/Nazara/Utility/Mouse.hpp

@@ -28,6 +28,9 @@ class NAZARA_API NzMouse
 			Max = XButton2
 		};
 
+		NzMouse() = delete;
+		~NzMouse() = delete;
+
 		static NzVector2i GetPosition();
 		static NzVector2i GetPosition(const NzWindow& relativeTo);
 		static bool IsButtonPressed(Button button);