[heycam/webidl] Rename all legacy extended attributes (#870)

This pull request contains a series of commits that together close #350. I suggest we rebase-merge, instead of squash-merge, to better make the individual changes clear from the history.

I've updated #350 with a list of specifications that use these extended attributes, and will work on corresponding pull requests to them.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/870

-- Commit Summary --

  * Rename [LenientSetter] to [LegacyLenientSetter]
  * Rename [LenientThis] to [LegacyLenientThis]
  * Rename [OverrideBuiltins] to [LegacyOverrideBuiltIns]
  * Rename [TreatNonObjectAsNull] to [LegacyTreatNonObjectAsNull]
  * Rename [Unforgeable] to [LegacyUnforgeable]
  * Rename "named constructors" to "legacy factory functions"
  * Rename [TreatNullAs=EmptyString] to [LegacyNullToEmptyString]
  * Rename [NoInterfaceObject] to [LegacyNoInterfaceObject]
  * Group and alphabetize legacy extended attributes

-- File Changes --

    M index.bs (1813)

-- Patch Links --

https://github.com/heycam/webidl/pull/870.patch
https://github.com/heycam/webidl/pull/870.diff

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