Style: Replace header guards with #pragma once

scene/gui/separator.h

@@ -28,8 +28,7 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
 /**************************************************************************/
 
-#ifndef SEPARATOR_H
-#define SEPARATOR_H
+#pragma once
 
 #include "scene/gui/control.h"
 class Separator : public Control {
@@ -66,5 +65,3 @@ class HSeparator : public Separator {
 public:
 	HSeparator();
 };
-
-#endif // SEPARATOR_H