Restructures input-explainer.md to improve clarity and prep for hit-testing proposal #492
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While working on the proposal for adding hit testing to WebXR, it became clear that to easily explain the new hit testing concepts, the input explainer needed a bit of house keeping. I ended up moving a large portion of the document content around, so it may be easier to just view the new version of the document rather than the diff.
The intent with this PR is to clarify the descriptions of existing functionality, not to introduce changes in that functionality. That said, I expect we may uncover shared misunderstandings through the cleaner text, so please do call out things that don't match your expectations. I also removed the grab-and-drag sample code for the moment; it makes a reappearance in the hit-testing-explainer in PR #493
For ease of diffing, the base for this PR is adding-viewerSpace branch behind PR #491