Simplify and fix Ogre -> Urho skeleton & animation conversion.
Simplify and fix Ogre -> Urho skeleton & animation conversion.

realXtend/tundra-urho3d,realXtend/tundra-urho3d,realXtend/tundra-urho3d,realXtend/tundra-urho3d,realXtend/tundra-urho3d