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

…e names we store for a type.

… aliases.

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

… VB types.

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

…mClassesAsync

…FromInterfacesAsync and FindDerivedClassesAsync

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.

More cleanup to do between RoslynCompletionSet and
FilteredRoslynCompletionSet.

Support VS "15" specific features

Allow to open existing projects (if solution already contains that
project).

This supports running an analyzer that warns when a user implements these interfaces.

A prerequisite to fix dotnet/roslyn-analyzers#863.

- Copied the remark from `ISymbol` derivations on all public interfaces that derive from `IOperation`
- Added remark and `[InternalImplementationOnly]` on `IOperation`
- Removed `[InternalImplementationOnly]` from `ISourceAssemblySymbol` because it was only there, unneeded

JSON spec makes escaping of forward slashes optional and many have
complained about the aesthetics of '\/'. Previously, we got this
behavior from the DataContractJsonSerializer and could not override
it, but now that the dependency has been removed, we can eliminate
the unnecessary escaping.

Also, defer to TextWriter for NewLine character rather than
hard-coding Environment.NewLine.

Also remove outdated future improvement comment

Also make ErrorLogger tolerate "external" locations.

…arallel.

Removed stray > from documentation comments

Order Fully-Qualify results if we believe a certain fix would be better than another one

Fixes #11071

…erence

Do a better job inferring where type parameters will be used when generating methods.

Fixes #11141

* Fix formatting of ref/out parameters in Scripting

This is used when displaying exceptions in csi.

Previously, ref/out parameters in stacktraces were shown incorrectly,
and even threw NRE when the type of the ref/out parameter was a type parameter.

Fixes the fixable part of #11284

Also mentioned converting to string using ToString

Fixes unintended move of banner text, as reported in issue #8797.