fixing emscrippten warning and fixing windows artefact name

.github/workflows/build_windows.yml

@@ -38,5 +38,5 @@ jobs:
       - name: Archive production artifact for Windows binary
         uses: actions/upload-artifact@v1
         with:
-          name: BombermanWindow
+          name: BombermanWindows.exe
           path: build/Debug/bomberman.exe

lib/wal/sources/System/System.hpp

@@ -71,9 +71,11 @@ namespace WAL
 		explicit System(Wal &wal)
 			: _wal(wal)
 		{}
+
+	public:
 		//! @brief A system can't be instantiated, it should be derived.
-		System(const System &) = default;
+		System(const System &) = delete;
 		//! @brief A system can't be instantiated, it should be derived.
-		System &operator=(const System &) = default;
+		System &operator=(const System &) = delete;
 	};
 } // namespace WAL