OMI_collider

[aaronfranke]

This PR adds OMI_collider. It supersedes #118. This PR takes #118, overhauls the text to be more readable, updates the table of equivalent types in major engines, adds some discussed features, fixes and completes the schema, and adds a folder of example GLTF files.

Preview: https://github.com/aaronfranke/gltf-extensions/tree/OMI_collider/extensions/2.0/OMI_collider

I have the document listed as a Stage 2 proposal. This PR meets all of the requirements of Stage 1 and Stage 2.

Stage 1

• High level outline published as a GitHub PR in this repository. (this PR)
• Signed W3C CLA. (yes)

Stage 2

• Previous requirements from Stage 1. (yes)
• One metaverse implementation of the extension in development. (yes, in Godot Engine)
• Valid and publicly accessible sample assets. (yes, see examples/ subfolder)
• Valid JSON schema describing the extension in its entirety. (yes, should be valid)
• Markdown document explaining the purpose, features, and properties of the extension. (yes, see the OMI_collider/README.md file in this PR)

Stage 3

• Previous requirements from Stage 2. (yes)
• Two or more metaverse implementations. (not yet, just Godot Engine)
• glTF Validator implementation. (yes, here's the pull request)
• Publicly available content creation tool for generating assets for this extension. (the Godot Engine implementation can export OMI_collider, although note that it will also export with OMI_physics_body)
• All implementations, sample assets, and content creation tools should consume or produce assets that pass validation. (awaiting more implementations)

[mrmetaverse]

Thanks for the demo yesterday (and last week too!) I can assign a reviewer and add this to the backlog to track on the main kanban. I know you had some questions about the process, and believe you all intend to discuss them during today's meeting, but feel free to update any changes in the comments.

[RangerMauve]

This is great thank you for picking this up!

[robertlong]

Vote to merge this PR passed with consensus

[robertlong]

Looks good!