[heycam/webidl] Remove support for overloading callbacks (#690)

This was only supported in the definition of the effective overload set, but
this wasn't actually used anywhere, and there is no syntax to overload a
callback anyway.

The six types of IDL constructs are the five that were in the specification
before this change, and legacycallers. The count was not updated when these
were removed.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/690

-- Commit Summary --

  * Remove support for overloading callbacks

-- File Changes --

    M index.bs (13)

-- Patch Links --

https://github.com/heycam/webidl/pull/690.patch
https://github.com/heycam/webidl/pull/690.diff

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