Format 'unsafe' blocks according to user settings.

We should have structure guides and outlining for 'fixed' and 'unsafe' statements.

Implement IDkmClrFormatter2 and IDkmClrFullNameProvider

Move VS SDK references to 26127.00

Use property (instead of reflection) now that we've updated to a more recent SDK.

Use an unused accelerator key.

Merge master into post-dev15

# Conflicts:
#	src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs

Fixes #14202

Always create dedicated InitializerSemanticModel for parameter default value.

Even for cases when the parameter is not part of a type member declaration, i.e. owned by an anonymous method or a local function.
Fixes #16748. Fixes #16374.

Also implement SemanticModel.GetDeclaredSymbol(ParameterSyntax) for parameters of a Local Function.
Fixes # 16757.

Some more automated tests and test cleanup for the PR#16659

* add end to end stack depth test

* add comment explaining test

* switch to verify diagnostics

* turn parallel build off

* check pointer size in addition to debug/release

removed additional cost I can find from trace compared to code before…

Enable Code Fixes in F# (RC3 regression)

https://github.com/dotnet/roslyn/pull/16659

added tests, made the included tuple2 chunk a CData

Fixes #16352

Merge master into post-dev15

Fixes Microsoft/visualfsharp#2329

Implements GetDeclaredSymbol for tuple literals and GetSymbolInfo for elements of tuple literals.

Merge master into post-dev15

# Conflicts:
#	src/EditorFeatures/CSharpTest/CSharpEditorServicesTest.csproj

Merge dev15-rc3 into master