Moved many APIs to async which contained wait calls.  Forces developers
to use async now in tests when appropriate.

The casing of app.config was incorrect in several of the project files.
This broke tests on Linux / Mac.  Corrected the case.

This merges the two approaches for diagnosing IAsncyToken usage.

This change moves a good chunk of the IDE suites to be async.  This is
necessary in order for them to correctly pump and wait for tasks in the
STA environment.

The WpfTestCase pump now correctly interleaves pumping dispatcher
messages and moving the StaTaskScheduler queue forward.

This change makes foreground scheduling code predictable in the IDE
tests.  Instead of using a static to hold the data we use instance
values.  The static data the instance values are populated from are not
100% predictable but far more so than they used to be.

These tests were essentially deadlocking because the current scheduler
here is the StaTaskScheduler.  When the original thread hit the Wait
call the inlining code in the scheduler allowed the Task created in the
method body to run inline on the original thread.  This quickly lead to
a deadlock as both threads ended up waiting for each other in a blocking
fashion.

Fixed this by forcing the Task in the method body to run in the thread
pool.

Some tests just get views without actually constructing a test
workspace.  This arguably may have other bad consequences, but it
definitely doesn't work with the editor's copy of
ForegroundThreadAffinitizedObject.