DisplayObjContainer hitTest optimization

increased performances of DisplayObjContainer hitTest when targetSpace
is Stage (and most of the tests are in stage space)
Quad improvements

- A quad has always the same vertex order, no matter the coordinate
system
- seColors method accept also named colors and hex strings instead of
only Color objects
vertexForma added as member and set to nil on disposal
extended comments for Quad:setShader
updateTransformationMatrix optimization

skip parent update / inheritance / ecc. if the parent is the targetSpace