CreateThumbnail action and test
Using stage batch instead of creating a new one.
Moved some cooldemo resources
Merge pull request #673 from anserran/thumbnailcreator

Create Thumbnail action, to create static images of model entities
Fix in tracker
Fixes #555
Fix fit
Component storing scene edition state
SceneEditor processing/updating the state
Added necessary methods to GroupEditor
Merge pull request #676 from anserran/scenestate

Component to remember scene panning and zoom across editions