structuredquery is required to support AQS filters in Windows.Devices.Enumeration's `FindAllAsync` methods, this adds a basic set of stubs to get the ball rolling.
-- v8: dlls/structuredquery: Add stubs for IQueryParserManager. dlls/structuredquery/tests: Add conformance tests for IQueryParserManager. include/structuredquery.idl: Add IQueryParserManager. dlls/structuredquery: Add stubs for QueryParser. dlls/structuredquery/tests: Add conformance tests for QueryParser. dlls/structuredquery: Add stub DLL. include: Add structuredquery.idl.