Fix project file for EE

Updating the Perf Tests to correctly locate the PerfTests on the PerfMachines.

Don't classify 'var' in 'out var' as a keyword.

Fixes #4190

Replace packages.config with project.json

Add explanatory comment

Check SupportsCompilation before retrieving compilation

Share doc comment finding code

Command submissions (e.g. ```#reset```) don't have compilations.

Correctly Generate Interface in Generic Class
Fixes #2785

The code was duplicated between scripting and workspaces because it is
partially non-portable.  Share the files by linking (and, unfortunately,
ifdef'ing) instead.

Use generic name if class we are generating into is generic

work around a bug when running an analyzer test in 64-bit

Fix options serialization issue causing the VB language settings to deserialize within a C# project

When showing completion for conditional access, walk up the tree to f…

Fixes #4750 

Better error handling in highlight references

Make Rename ignore readonly Interactive buffers

Fixes #4570

Asynchronously determine whether to refresh class view

Completion API Options

Fixed typo ("than" => "then")

If we could not get the symbol to HR from the semantic model, do not try
creating tags for it. This fixes the HR crash part of #4918

Automatic line ending for expression bodied members in C#. Fixes #3944.

Add version of Microsoft.CodeAnalysis.Analyzers to targets

Fix check for missing/unsupported language

Disable Obsolete checks for project level imports.