change all attributes on `<mr-app>` to `data-attributes`

[hanbollar]

Linking

Fixes https://github.com/Volumetrics-io/mrjs/issues/518

Problem

we dont want to keep having to do this.getattribute('string') since the string part can be faulty

Solution

change everything to a data-attribute - see issue being fixed for more information

Breaking Change

100% yes - documentation, examples, and current live items need to be updated for this change

Notes

...

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Required to Merge

• [x] PASS - all necessary actions must pass (excluding the auto-skipped ones)
• [x] TEST IN HEADSET - main dev-testing-example and any of the other examples still work as expected
• [ ] VIDEO - if this pr changes something visually - post a video here of it in headset-MR and/or on desktop (depending on what it affects) for the reviewer to reference.
  • still works as before, just api change
• [x] TITLE - make sure the pr's title is updated appropriately as it will be used to name the commit on merge
• [x] BREAKING CHANGE
  • DOCUMENTATION: This includes any changes to html tags and their components
  • make a pr in the documentation repo that updates the manual docs to match the breaking change
  • link the pr of the documentation repo here: https://github.com/Volumetrics-io/documentation/pull/55
  • that pr must be approved by @lobau
  • SAMPLES/INDEX.HTML: This includes any changes (html tags or otherwise) that must be done to our landing page submodule as an effect of this pr's updates
  • make a pr in the mrjs landing page repo that updates the landing page to match the breaking change
  • link the pr of the landing page repo here: #pr
  • that pr must be approved by @hanbollar

[render[bot]]

Your Render PR Server URL is https://examples-mrjs-pr-660.onrender.com.

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[hanbollar]

@michaelthatsit heads up - i couldnt really test some of the data- attribute changes (most i could visually/through pre-existing examples we had) - adding you on review to do a onceover as well to make sure i didnt miss anything ~

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what ive confirmed as working:

• [x] data-debug
• [x] data-orbital
• [x] data-preserve-drawing-buffer
• [x] data-stats
• [x] data-camera

what i couldnt confirm but looks right to me:

• [ ] data-lighting
• [ ] data-occlusion
• [ ] data-layers