It is only used in the the "await x" sample text for quickinfo of
awaitable methods, where it should not be localized. Replace it with the
text of the await keyword.

These tests were all using WpfFact, but not actually doing anything
that required either WPF or an STA thread. We plan to enable
parallelization of Facts (but not WpfFacts), and this ensures we can
parallelize as many tests as possible.

...as if they were locals.

Fixes #5069

* Convert the ICompletionProvider interface to a CompletionListProvider abstract class.
* Rename CompletionItemGroup to CompletionList
* Introduce a CompletionListContext type to be used by providers to specify the contents and
  details of CompletionLists with a RegisterCompletionListAsync() method.
* Change GetGroupsAsync() method to GetCompletionListAsync(), which returns Task<CompletionList> rather
  than Task<IEnumerable<CompletionList>>.
* Move code that merges, de-dupes and sorts completion lists from the controller into the
  completion service. This affected a few VB spell check unit tests which now change their ordering
  slightly.

Nameof now allows member access from locals, etc. Completion shouldn't
restrict member access to only types and namespaces.

Need to ensure that items from the current context are preferred over
ones from other contexts.

Only show the warning icon if there's no member/type with the same kind
and name available.

Don't show warning icon for differing method overloads between heads,
unless none are available.

Fixes #33

Fixes #1277

also remove multi-line DisposePattern resource string which contained code
because this was very problematic when it came time to
parse/format/simplify it and replace it with multiple resource strings

Automatic brace completion of "(" parses as a cast, but the user might
be trying to type a parenthesized expression.

move duplicate localized string to WorkspacesResources and remove all occurences of the hard-coded version