Support additional .x3dj standard in X3DSAIL (required by x3d-tidy)
Mentioned here:
https://www.web3d.org/x3d/stylesheets/X3dToJson.html
https://www.web3d.org/specifications/X3dGraphicsStandardsRelationships.png
Not there, but plenty of room for both .json and .x3dj
X3DJSONLD has moved to .x3dj as well, with patches that override .json with .x3dj in X3DJSAIL. Supporting both would be nice, but not all tools can do that (Spine, I think requires .json).
John
Diff:
Not sure if you saw this Castle Model Viewer article:
https://forum.castle-engine.io/t/x3d-json-loading-example-in-testing/1993
Since Castle supportt Spine as .json, I had to do something else. .x3dj seemed natural enough, since Holger used it.