Replace deprecated headers

To remove warnings about deprecated headers and for more robust C++, this replaces the deprecated C header with its C++ equivalent.

src/modules/keyboardmanager/ui/pch.h

@@ -2,8 +2,8 @@
 // Do not define WIN32_LEAN_AND_MEAN as WinUI doesn't work when it is defined
 #include <unknwn.h>
 #include <windows.h>
-#include <stdlib.h>
-#include <string.h>
+#include <cstdlib>
+#include <cstring>
 #include <thread>
 #include <winrt/Windows.system.h>
 #include <winrt/windows.ui.xaml.hosting.h>

tools/CleanUp_tool/main.cpp

@@ -1,6 +1,6 @@
 #include <windows.h>
-#include <stdlib.h>
-#include <string.h>
+#include <cstdlib>
+#include <cstring>
 #include <shlwapi.h>
 #include <shlobj.h>