Users now can preview stl and obj files in the browser

Was achieved through https://github.com/tbuser/thingiview.js

Obj and stl files can now be viewed in the browser. As this is rather heavy and can slow down older computers, it is not directly loaded. I added a button that, when clicked, lets the model be displayed. This way the page with the file can still be opened on older computers with them slowing down.

I think beeing able to preview 3D files in seafile would be a nice feature.