Copy/paste REPL clipboard format

Copy all selected text to clipboard for Text and RTF formats and add a custom
REPL format that contains the entire selection but differentiates inputs, outputs,
and prompts. Paste uses the REPL format if it exists and pastes inputs and
outputs but not prompts.

Conflicts:
	src/EditorFeatures/CSharpTest/Diagnostics/Async/AddAwaitTests.cs
	src/Features/CSharp/Portable/CodeFixes/Async/CSharpAddAwaitCodeFixProvider.cs
	src/Features/VisualBasic/Portable/CodeFixes/Async/VisualBasicAddAwaitCodeFixProvider.vb

Audit the usage of Stream.Read within compilers.

Comment our workspace Try* methods hinting you probably want something else

Skip test SuggestEscapedPredefinedTypes on x64

Fixes #5267.

Broken by PR #5197, tracking bug #5391

added logging info to GlobalOperationRegistration

guard us from crashing when VS ran under environment where SHA256 is …

This cleans up Nuget stuff in the Roslyn Code Base.

Fix finding xml help files for winmds in Visual Studio.

* This updates all references to nuget.exe to use the copy in the root.
* This deletes all NuGet.config and NuGet.exe files that are not in the root.
* This removes all references to NuGet.targets (which is obsolete and no longer exists)

Offer to add await if converting from Task<T> to T
Fixes #5137

added MS.VB and MS.CSharp as explicit ignored assemblies list for analyzer dependency checker

Add myget buildtools feed to NuGet.config for Microsoft.Build.Mono.Debug

Handle CodeFix with bad ImmutableArray
Fixes #2002

Check IsDefault of any ImmutableArray given for FixableDiagnosticIds, to ensure that it has been properly initialized.
Throw and InvalidOperationException to let the user know to fix their CodeFixer.

Prefer normal files over auto generated files for code generation destinations

guard from null diagnostic

Cleaning up code. Only scripting uses the TryFindXmlDocumentationFile
helper. So moving it to that project and removing code that it doesn't
need.