Includes missing formula headers

Includes the necessary formula headers in the camera trait files for different rendering engines.
This ensures that the required mathematical functions and definitions are available when using camera traits.

include/omath/vector4.hpp

@@ -198,7 +198,6 @@ namespace omath
         {
             return {static_cast<Type>(other.x), static_cast<Type>(other.y), static_cast<Type>(other.z)};
         }
-    }
 #endif
 };
 } // namespace omath

source/engines/iw_engine/traits/camera_trait.cpp

@@ -2,7 +2,7 @@
 // Created by Vlad on 8/11/2025.
 //
 #include "omath/engines/iw_engine/traits/camera_trait.hpp"
-
+#include "omath/engines/iw_engine/formulas.hpp"
 namespace omath::iw_engine
 {
 

source/engines/opengl_engine/traits/camera_trait.cpp

@@ -2,7 +2,7 @@
 // Created by Vlad on 8/11/2025.
 //
 #include "omath/engines/opengl_engine/traits/camera_trait.hpp"
-
+#include "omath/engines/opengl_engine/formulas.hpp"
 
 namespace omath::opengl_engine
 {

source/engines/source_engine/traits/camera_trait.cpp

@@ -2,7 +2,7 @@
 // Created by Vlad on 8/11/2025.
 //
 #include "omath/engines/source_engine/traits/camera_trait.hpp"
-
+#include "omath/engines/source_engine/formulas.hpp"
 namespace omath::source_engine
 {