Extension:StlHandler

This Extension gives user the ability to view and manipulate with 3D objects in STL file format.

Known issues

 * 1) ✅ Object rotation not working in Firefox
 * 2) File page shows object size 0px X 0px
 * 3) File page reports the file type as possibly harmful

Ideas about further development

 * 1) Short user guide to display next to object canvas on file page (scroll to zoom etc)
 * 2) Make viewer touch-enabled