- started implementing viewport system:
 * work in progress!
 * added base element, hooks to main three-js element, camera linking
- continued implementing basics of viewport system:
 * modified controls & their initialization: now need only their relevant domElement
and not a three.js renderer anymore : modified calls accordingly
 * added support for specific controls to viewports : add3 method, various boilerplate
 * added experimental infering of width/height/bottom/left values from css styling
for controls
 * modified main three.js element rendering, controls support to accomodate for viewports
 * updated demo to match all these changes
 * all still work in progress!
- more changes to databinding for position/rotation of 3d elements
 * does not override inner "object3D"'s position/rotation anymore
 * some minor cleanup
- more experimenting with post processing : viewports not yet supported