Whitespace
UI Selection: Imporoved the pinch scaling gesture.
UI Image: Changed module name property.
Engine SVG: tspan elements are first appended to a document.fragment before they are appended to the DOM.
All: Layers have a new property called plane. It defines on what "plane" a layer operates. For example "baseline", "background", or "foreground".
Model Layer: Changed plane type from 'layer' to 'baseline'.