- changes in Scene opening (all callbacks are coming on the EDT now)
- optimize selection callbacks
- optimize/simplify threading
- recognize changes in classpath and recreate ClassPath for AssetManager based on that
git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@8621 75d07b2b-3a1a-0410-a2c5-0572b91ccdca