Allow duplicated name and use Actor ID as a unique key to define animation.

Allow duplicated name and use Actor ID as a unique key to define animation.

 - We don't need to make crash when multiple nodes had same name.
 - DALi actor also allows duplicated name.
 - Because name is not an unique key, make AnimationDefinition use Actor ID as a key.(for glTF)
    - glTF don't use name as a key.

Change-Id: Ibcb3e21640cf2a8124bb450b73159eeaf1cdf4f3
Signed-off-by: seungho baek <sbsh.baek@samsung.com>