[heycam/webidl] Adds [CatchTypeErrors] extended type attribute to stop TypeErrors from propagating during conversions (#597)

DO NOT REVIEW YET. Just posting this for comments on the Manifest spec. See w3c/manifest#611
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/597

-- Commit Summary --

  * Added [CatchTypeErrors] extended attribute.
  * Add rules for processing [CatchTypeErrors] in the type converters.

-- File Changes --

    M index.bs (86)

-- Patch Links --

https://github.com/heycam/webidl/pull/597.patch
https://github.com/heycam/webidl/pull/597.diff

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