Fixed all the compiler warnings, fixed depreciated screenshot function

src/Camera.cpp

@@ -1,4 +1,3 @@
-#pragma once
 #include "Camera.h"
 #include "Pub_Sub.h"
 
@@ -201,4 +200,4 @@ sf::Vector3f Camera::get_position() {
 
 sf::Vector2f Camera::get_direction() {
 	return direction;
-}
+}