Support model.transform

Combine it with transform introduced as function parameters

src/models.c

@@ -1218,11 +1218,13 @@ void DrawModelEx(Model model, Vector3 position, Vector3 rotationAxis, float rota
     Matrix matRotation = MatrixRotate(rotationAxis, rotationAngle*DEG2RAD);
     Matrix matScale = MatrixScale(scale.x, scale.y, scale.z);
     Matrix matTranslation = MatrixTranslate(position.x, position.y, position.z);
+    
+    Matrix matTransform = MatrixMultiply(MatrixMultiply(matScale, matRotation), matTranslation);
 
     // Combine model transformation matrix (model.transform) with matrix generated by function parameters (matTransform)
     //Matrix matModel = MatrixMultiply(model.transform, matTransform);    // Transform to world-space coordinates
 
-    model.transform = MatrixMultiply(MatrixMultiply(matScale, matRotation), matTranslation);
+    model.transform = MatrixMultiply(model.transform, matTransform);
     model.material.colDiffuse = tint;       // TODO: Multiply tint color by diffuse color?
 
     rlglDrawMesh(model.mesh, model.material, model.transform);