[#15] Pragma once for life!

Signed-off-by: Tobias Frisch <tfrisch@uni-koblenz.de>

src/vkcv/CoreManager.cpp

-#define GLFW_INCLUDE_VULKAN
 
 #include "CoreManager.hpp"
 
@@ -24,4 +23,4 @@ namespace vkcv {
         }
         glfwCounter--;
     }
-}
\ No newline at end of file
+}

src/vkcv/CoreManager.hpp

-#ifndef VKCV_COREMANAGER_HPP
-#define VKCV_COREMANAGER_HPP
+#pragma once
 
 #include <GLFW/glfw3.h>
 #include <stdexcept>
@@ -15,5 +14,3 @@ namespace vkcv {
      */
     void terminateGLFW();
 }
-
-#endif //VKCV_COREMANAGER_HPP