Update readonly ref from master

This needs to be done before the merge from master so that we can properly verify the infrastructure changes.

Move more infrastructure to Powershell

Recently created VSLangProj2 package depends on VSLangProj (>= 7.0.3300),
which depends on EnvDTE (>= 8.0.1).

Changed use of SystemException to InvalidOperationException to avoid …

Corrected various misspellings of `IDiagnosticAnalyzer` in code comments

Disabling RenameOverloadsCSharp

Disable more flaky tests

Update FixAllProvider.md

Fix hyperlink to DeclarePublicAPIFix.cs

Add IOperation unit tests for ISymbolInitializer

Utilise PooledStringBuilder

Strip inheritance nodes from outer types when we move a type to a new file

Preserve file banner when generating a type in a new file.

Better handle trivia when inlining a C# variable declaration.

Prefer results from 'System' namespaces in Add-Using.

Offer to generate fields/properties even if the name matches a type-name

* Update linux job names

* Change link path

Update to DSRN 1.5.0

Extract BenchView helpers to utilities so tests that don't use CPC ca…

Implemented  ref conditional operator (aka: ternary ref)