Consolidated all attribute panels into a single uber attribute panel

Consolidated all attribute panels into a single uber attribute panel. Now its all much simpler and easier to maintain. 

Made `Sidebar.Attributes()` class to replace all of the following:

Sidebar.Object3D.js
Sidebar.Geometry.js
Sidebar.Material.js
Sidebar.Geometry.PlaneGeometry.js
Sidebar.Geometry.CubeGeometry.js
Sidebar.Geometry.CylinderGeometry.js
Sidebar.Geometry.SphereGeometry.js
Sidebar.Geometry.IcosahedronGeometry.js
Sidebar.Geometry.TorusGeometry.js
Sidebar.Geometry.TorusKnotGeometry.js