Add file structure to code

- Rename project to CopiumEngine

CopiumEngine/ext/include/glm/gtx/mixed_product.inl

@@ -0,0 +1,15 @@
+/// @ref gtx_mixed_product
+
+namespace glm
+{
+	template<typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER T mixedProduct
+	(
+		vec<3, T, Q> const& v1,
+		vec<3, T, Q> const& v2,
+		vec<3, T, Q> const& v3
+	)
+	{
+		return dot(cross(v1, v2), v3);
+	}
+}//namespace glm