Make Empty.Set<T> conform to ISet<T> norms

Resolve merge issue that caused duplicate VB error IDs

Ensure string resources are included for all diagnostic ids

Adrian pointed out that AnalyzerAssemblyLoader.LoadFromPathUnchecked was missing cache hits on _loadedAssembliesByIdentity for same assemblies (analyzer dependencies) loaded from different paths. This was causing large number of redundant ModLoads, which should now be fixed.
Fixes VSO [249557](https://devdiv.visualstudio.com/DevDiv/_workitems?id=249557&fullScreen=false&_a=edit)

Create nuget for Microsoft.CodeAnalysis.Remote.Workspaces...

Remove unneeded roslyn-build-tools

Fix the generated path for the TranslationFile

Moved the packages on that feed to roslyn-tools.  Deleting the feed entry as we no longer need it now.

Adjust scope of locals declared within While/Do/Lock/If Statements according to the latest design.

Support completion items with no Glyphs (for JavaScript).

Remove EnC specific methods from the Syntax API.

Remove settings file

Decouple SyntaxList from SyntaxListBuilder.

The tool now lives under dotnet/roslyn-tools.

We have seen two big analyzer packages (CodeCracker and RefactoringEssentials) end up with registering async actions, which can crash VS from the async continuations.
See [this](https://github.com/code-cracker/code-cracker/issues/375#issue-87474837) for more details. Now we prevent this by disallowing analyzers to register async callbacks.

Fixes https://github.com/dotnet/roslyn/issues/13120

Remove `replace` references: IDS_FeatureReplace and SyntaxModifiers.Replace

Add InternalsVisibleTo for MonoDevelop

Small clean up: remove unnecessary #ifs, usings, whitespace

added solution checksum updating service

Updating the build property from 'VisualStudioInstallDirectoryFromRegistry' to 'IsDev15BeforePreview4'

Fix #12818

* CommonPEModuleBuilder refactoring

* Renames

* Use CommonPEModuleBuilder instead of IModule

* Remove IModule

* Move GetFiles to module builder

* Remove IAssembly

* Add comments, PR feedback

* Resolve merge conflicts