Atoms Character file format

"version":  IntMetadata
"root":  StringMetadata
"jointRotation":  MapMetadata,
                  "root": QuaternionMetadata,
                  "spine1": QuaternionMetadata,
                  "spine2": QuaternionMetadata,
                  ...
"jointWorldMatrix":  MapMetadata,
                  "root": MatrixMetadata,
                  "spine1": MatrixMetadata,
                  "spine2": MatrixMetadata,
                  ...,
"chains": ArrayMetadata,
          0: MapMetadata,
                "name": StringMetadata,
                "fullName": StringMetadata,
                "type": StringMetadata,
                "sub_type": StringMetadata,
                "horizontal": StringMetadata,
                "vertical": StringMetadata,
                "depth": StringMetadata,
                "index": UIntMetadata,
                "jointList": StringArrayMetadata,
                "jointFullNameList": StringArrayMetadata,
                "isRoot": BoolMetadata,
                "isSpine": BoolMetadata,
                "isLimb": BoolMetadata,
                "isEffector": BoolMetadata,
                "isCenter": BoolMetadata,
          1: ...