Add support for explicitly-defined compound triggers in GLTF files #88301
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Implements omigroup/gltf-extensions#206 in Godot.
This PR adds explicit compound triggers, specified by a new
"nodes"property under the"trigger"property inside of the"OMI_physics_body"extension on nodes.Amazingly, this PR preserves bidirectional compatibility with the current master. Files exported in this PR will import correctly in master, and files exported in master will import correctly in this PR. Not all files will import the same of course, a hand-crafted file or a file created outside of Godot may import differently, and note that I am not talking about 4.2, a file exported in 4.3 won't keep physics when imported in 4.2 due to another PR that changed the format.
Example file: https://github.com/omigroup/gltf-extensions/blob/main/extensions/2.0/OMI_physics_body/examples/basic/compound_trigger.gltf
This is one of those hand-crafted files I mentioned in the paragraph above, where it will import incorrectly without this PR. When using this PR, it will import correctly and will look like this: