[PATCH v2 0/6] MR464: Implement _StructuredTaskCollection::_Schedule{,_loc}

[Torge Matthies (＠tmatthies)]

- Based on !463 
- _RunAndWait and exception handling implemented in later commits

@piotr

--
  v2: msvcr100: Implement _StructuredTaskCollection::_Schedule and _Schedule_loc.
      msvcr100: Make ExternalContextBase reference-counted.
      msvcr100: Factor out the mapping of a context to a scheduler.
      msvcr100: Factor out EXCEPTION_RECORD to exception_ptr conversion.
      msvcr100: Move exception_ptr functions to a separate file.
      msvcr100: Implement invalid_multiple_scheduling exception.

https://gitlab.winehq.org/wine/wine/-/merge_requests/464