Added note about zeroing unused bits in bitstreams #620
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This was brought up via slack and mentioned in #617 . It originally (only) referred to the availability bitstreams of
3DTILES_implicit_tiling, but this section mainly links to the "Storage Formats --> Binary Table Format --> Booleans" section of the Metadata spec, so we thought that it could make sense to add this as a general requirement there:https://github.com/CesiumGS/3d-tiles/blob/c0d63ec8cf36b4b5d75c0ac031ea9bc4d5a53ae9/specification/Metadata/README.md#booleans
(This ensures that two "data sets" that describe "the same data" are bitwise equal, by making sure that there are no random, unspecified bits contained in the data)