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/vector2.hpp

@@ -226,7 +226,7 @@ namespace omath
             return {static_cast<float>(this->x), static_cast<float>(this->y)};
         }
         [[nodiscard]]
-        static Vector3<float> from_im_vec2(const ImVec2& other) noexcept
+        static Vector2 from_im_vec2(const ImVec2& other) noexcept
         {
             return {static_cast<Type>(other.x), static_cast<Type>(other.y)};
         }

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
 {