Fix interactive window crash by resetting history navigation when hits...

Share test code

Move ClrOnlyFact to TestUtilities.Shared

Elimination of reference duplicates in the ReferenceManager should not depend on order

Fix interactive window crash by resetting history navigation when hits the end of submission history

An `ArgumentOutOfRangeException` exception would be thrown when navigating past the end of submission history.
Stop navigating when `History.GetNext()` hits the end of submission history list fixes this issue.

Use the new Find LaF in Interactive

Harden against null arguments in simplifier
Fixes #5121

Explicit implementers can't use the new Find Look-and-Feel without also
using private hooks (per @dpugh).  Since we were only delegating down the
chain, which is what would happen anyway, there's no need for us to do so.

Respect noconfig in InteractiveEvaluator

always show signature help when explicitly invoked

Don't consume the response file when re-initializing after ```#reset
noconfig```.  The host already handles this correctly.

Fixes #4397.

Integration test to follow.

Fix Add using under chained conditional access expressions.

Implement missing LangVersion checks for new features/relaxations introduced in VB14.

Minor SourceFileResolver fixups...

Fixed code styles and added one more test.

Fixes #5072.
Also fixed some issues around LangVersion handling, which were found along the way.

Swallow ArgumentOutOfRangeException while retrieving custom debug info

Disable snippets in the Interactive window

Moving simplifier tests from ServiceTest to EditorServicesTest2

- Undo some refactoring of CommonCompiler.ReadFileContent
- Remove LoadDirectiveResolver
- Make SourceReferenceResolver.ReadText detect encoding
- Make SourceReferenceResolver.ReadText Dispose its Stream
- Generate Diagnostic if source contains #load and SourceReferenceResolver
  is not specified in ParseOptions

Use async read for process output

Fix crash in VerifyForwardedTypes

Add a new analyzer and code-fix to detect and recommend when people can use the auto-property pattern.