Fix model animation cache collision #5064
Merged
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Brought up on the forum: https://groups.google.com/forum/#!topic/cesium-dev/iKU4ORj0vNE
Since
buffer.path
is not defined for glTF 1.0 models (it was for 0.8), animations referencing different bin files could collide in the animation cache. This changes it to usebuffer.uri
instead, but only if it's not a data uri.