fix most of the stuff related to second loading of scene with scripting: mouse coords, proper events subscription/unsubscription, ...
fix auto-playing for scenes with scripting
Merge branch 'master' into fix-editor-incompatibilities
accidentally apply v1.0
fix unsafe removing of elements when disposing scenes, fix already-playing-check for dynamic modes, fix importing rotate-to-path tween
re-apply v1.0
Merge branch 'master' into fix-editor-incompatibilities
fire X_START and X_STOP event to all the children if they haven't fired already, which fixes the problem with overlapping sounds inside of parent scenes
remove console.log
Merge pull request #138 from Animatron/fix-editor-incompatibilities

Fix editor incompatibilities