Widget anchoring made better again, mouse areas fully working with
left/right/middle mouse button, memory leak fixed, versioning revisit
Added zooming to orthographic cameras, flipped Y axis for better 2D
representation
Flipping Y introduces a lot of problems
Flipping Y axis works now, 2D quads implemented for 2D/Orthographic
purposes
Scene graph on widgets, removed "anchoring". Started on IO
Added basic IO