More cleanup to do between RoslynCompletionSet and
FilteredRoslynCompletionSet.

1. Reference a bunch of stuff from Nuget packages instead of VS.
2. Move to Update 2 versions of packages.
3. Now that we are using the packages, we're referencing
   Microsoft.VisualStudio.Shell.14.dll instead of .15 again.  This means
   that types that moved to Shell.Immutable.15 are not type forwarders.
   Luckily we didn't need anything from Shell.Immutable.15 in the project
   where it was a problem.

Add missed code hooking up the option for /**/ comments

Extending the supported functionality of the VisualStudio IntegrationTest Utilities and adding the start of 'CSharpAutomaticBraceCompletion'

Avoid loading the Elfie dll until the user actualy enables the search feature.

Wrapping all `DTE` calls in `IntegrationHelper.RetryRpcCall`, as they tend to fail with `RPC_E_CALL_REJECTED`.

Improve OrderPreservingMultiDictionary.

Fixed complex trivia tab indentation

Fix #9945: Check if dynamic property is set-only when dotting off it

Generalize dynamic static-only restriction to include field initializers

Extending the supported functionality of the VisualStudio IntegrationTest Utilities and adding the start of 'CSharpAutomaticBraceCompletion'

Fix JSON serialization

Generalize dynamic static-only restriction to include field initializers (was just ctor initializers)

Fixes #11092

Fix #9719: Add Module kind to CLS Compliance checker

* Ensure that we suppress compilation diagnostics reported in generated code when the analyzer is configured to analyze generated code, but not report diagnostics on generated code.

Fixes #11217

* Address PR feedback to improve performance of AnalyzerDriver.IsInGeneratedCode

* Address PR feedback and modify test

1. Support allocation-free enumeration of the dictionary.
2. Pool internal data so that less garbage is churned when creating and releasing dictionaries.

Fix edge cases typing Enter before /**/ comments.

Add null checks before raising events. Fixes [217660](https://devdiv.visualstudio.com/DevDiv/_workitems?_a=edit&id=217660&triage=true)

Switch to straight metadata reading to build our metadata indices for add-using and add-reference.

Previouly we assumed that the type parameters in a method would not be of
the same TypeSymbol when generating a method and put them in a dictionary.
This causes exceptions when attempting to add to the dictionary and the
TypeSymbol is already added as a key. Now we use a list of instead of a
dictionary.

Fixes #10004