Introduce OpenCollada external library

Change-Id: I08a806b9319f7cb55be3b38a3bb9370799f6752b
Introduce Collada2gltf external library

Change-Id: I157f175ee6ea719e98ba45133f53cb4d2c3045bb
Use collada2gltf to open .dae files and convert them to .json.

Change-Id: Idb70da1db2516eeb6d518b39eb732a7e7d0a14ab