Fixes namespace and angle calculations

Corrects namespace naming from unity_engine to unreal_engine.

Adjusts projectile prediction and angle calculations for accuracy
in Unreal Engine environments.

source/engines/unreal_engine/formulas.cpp

@@ -46,4 +46,4 @@ namespace omath::unreal_engine
                 {0, 0, -1.f, 0},
         };
     }
-} // namespace omath::unity_engine
+} // namespace omath::unreal_engine