More test coverage for delegate invoke with conditional access

Ignore synthesized delegates in AnonymousTypeManager.GetAnonymousTypeMap

Add more diagnostic information to better understand what's happening if TestAddAndRemoveViaTextChangeManyTimes fails

Improve selection handling when sending to interactive

Changes needed to create a F# language service based on Roslyn workspace model 

Reduce VM usage for RPS tests by using a special back-door interface to mark analyzer as needing less work.

Fix bug in IVsSimpleLibrary2.CreateNavInfo(...) implementation where we were clearing string builders before they were used

Update Roslyn to DSR v1.0.7 release

Only move the caret if the enter was hit within the snippet fields.

Verify that bound node has ConstantValue even when underlying symbol has one.

.. that does not match the delegate invoke pattern we look for..

.. invocation fix/refactoring. Particularly around the pattern we look
for - a local, immediately followed by a check for null and invocation.
Adding some tests where the local declaration is grouped to the top and
not grouped with the pattern itself.

Renaming a helper, returning appropriately from a TryXXX() method etc.,
very minor code cleanups.

Fix bug in IVsSimpleLibrary2.CreateNavInfo(...) implementation where we were clearing string builders before they were used

Add more diagnostic information to better understand what's happening if TestAddAndRemoveViaTextChangeManyTimes fails

Fix params array argument operation

Fix #7867: Improve documentation of Diagnostic.Create properties argument

make msbuildtask not eat errors

Enable interactive commands

Base selection on the currently opened Document

Use 'nameof()' in places where we were initializing a variable with the string form of its name.

Run codeformatter on our code.

.. invocation fix/refactoring.. Notably, in cases where the code has a
local declared and if the declaration has multiple variables or if the
local is accessed outside of the invocation pattern, we do not touch the
declaration in anyway. However we still simplify the delegate invocation
pattern.

fix crash.

Archive only relevant artifacts

Also address code review comments.

Handle ErrorTypeSymbol as a ContainingSymbol of TypeParameterSymbol in CSharp.DocumentationCommentIDVisitor.PartVisitor.VisitTypeParameter.