[renderer] display model metadata

[andresoviedo]

From Google Play Reviews:

Can you integrate a folder reminder? It's a bit annoying to go through all the folders again and open the model. I like the new update now... It will be possible that in some future the names of the parts that make up the model can be displayed... I have a model that is made up of multiple parts, the viewer shows it correctly but I I mean to see the fields and groups of the model