Find references integration tests

"Find References" was recently updated to support searching for literals. This requires we update the FindReferencesToString test as it now finds results.

Always take screenshots when an exception occurs

Cleaning up add-import finding code.

Currently our integration tests only take a screenshot when an `XunitException` occurs. This is too narrow; other kinds of exceptions may occur and cause the test to fail, and we currently get no screenshots for those. This is especially problematic when an exception occurs in the VS process and is remoted and rethrown in the test process.

The only downside I see is that we will state to get screenshots for expected exceptions, but that seems like a very minor price to pay.

Only offer MoveType if the user is on the header for a type.

Make debug command line arguments parsing consistent on Unix platforms

Remove Preview 4 specific hack

Search entire DLLs directory for perf tests

added support for metadata xml doc comment

made syntaxtree and symbol tree info cache builder to run on OOP thro…

Ensure script compilations properly inherit return type from first compilation

Add test; update test infrastructure.

Adding comments.

	Respect code style when converting properties to methods.

Properly respect user preferences when converting methods into properties

Produce reasonable FAR results even for languages that don't export a classification service.

Add lock statement support in Syntax Generator