Add support for KMC chapters
1. add version to the schema serve in xml engien
2. When setting cue point on timed thumb asset set the asset id on the
cue point as well.
3. Remove automatic asset creation when creating thumb cue point
4. Add thumb cue point and timed thumb asset delete handlers.
5. other small changes as well
Minor changes after review
Merge pull request #1281 from kaltura/IX-9.17.0-LC-drop1

Ix 9.17.0 lc drop1 changes from applications