Rename internal code to 'FindUsages' so it better reflects that it can present results for more than just FindReferences.

Rename intenral code to 'FindUsages' so it better reflects that it can present results for more than just FindReferences.

Call into all CompletionProviders in parallel to speed up completion.

Remove Process Watchdog

Update `GitMergeBot` to support VSO repositories.

Restore RoslynTools.Microsoft.VSIXExpInstaller

Create MSBuild properties to make it easier to find and consume RoslynTools.Microsoft.VSIXExpInstaller.

We're going to need this soon, so may as well start restoring it now to make it easier to test.

	Extract method should introduce variables with 'var' if that is the user preference.

Fixes #15219

Simplify API for tests to create options.

Use immutable arrays with SymbolInfo to avoid Enumerator allocations.

Add a feature to suggest using explicit tuple names when they are available.

Use an EquivalenceKey for 'InlineDeclaration' so we don't get multiple offerings of the same fix on a single line.

Remove unused Camel_Case resource

Remove hard coded info about System.ValueTuple now that we're adding it to the nuget index.