fix for the first issue uncovered by the new Olimpic.
Introduce 3 types of Surfaces: System, Tree, User
Do not add Screen to the Surface lists.
Fix OutputSurface.resize(): before it couldn't be called mid-render.
- workaround for the issue with flashing in StarWars- return number of objects rendered from OutputSurface.render() and use this in Olympic- rework tree isomorphism so that it now works even if we don't render the whole tree (and also we don't have to reset() the Tree anymore!)...
Fix issue with Blur / Multiblur apps
1. Make it possible to enable/disable DEPTH test when rendering to a Screen2. Using this, remove the 'Root' Node from StarWars.
A lot of different fixes.
A lot of issues still there:
1) if we only render part of the tree, tree isomorphism will sometimes not work correctly2) when we change Effects that are inside Trees mid-render, even if we detach() the affected parts of the Tree first, for the last frame the new Effects will be used...
New, cleaner way to create/destroy DistortedSurfaces.
Serious regression in StarWars (crashes!). Looks like the Node's internal FBO is being deleted and not re-created in time.
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