Renamed CalculateBoundingBox() to MeshBoundingBox()

Renamed function for consistency with a possible Mesh manipulation functions (maybe added in a future). Naming follows Image*() manipulation functions.

examples/models/models_mesh_picking.c

@@ -38,7 +38,7 @@ int main()
     tower.material.maps[MAP_DIFFUSE].texture = texture;         // Set model diffuse texture
     
     Vector3 towerPos = { 0.0f, 0.0f, 0.0f };                    // Set model position
-    BoundingBox towerBBox = CalculateBoundingBox(tower.mesh);    
+    BoundingBox towerBBox = MeshBoundingBox(tower.mesh);        // Get mesh bounding box
     bool hitMeshBBox = false;
     bool hitTriangle = false;