* Report rude edits when updating method containing switch expression.

Fix stackalloc rude edits.

* Updating modifiers of local functions

* await foreach, await using

* Improve error message

* Distinguish async foreach/using from synchronous in error messages

* Using declaration

* Report rude edit when editing using statement/declaration around non-leaf AS

* Rude edits for switch with patterns

* Fix VB issues with active statements in nested single-line functions and when updating iterators

* Update comment

* Fix duplicate rude edit

* Fix region tracking for regions with local functions

Fixes #37427

* Add to test pre review comment.

Fixes #37467

Merge NullableAnnotation.NotApplicable and Disabled to None, and rename NullableFlowState.NotApplicable to None for consistency.

Use the SnapshotManager to store the variable types as it was already doing this, and handle nested scopes correctly.

Add GetDeclaredSymbol support for nullability in variable declarations. Not handled are linq or foreach iteration variable declarations.

Fixes #36091

Use NullableAnnotation.NotAnnotated always for value type annotations in the public API.

Previously, the annotation was NotAnnotated if the type reference was from source and Disabled if the type reference was from metadata.

Fixes #34412

Fixes #37310
Fixes #37279

If it's written to a warning annotation is displayed in the refactoring window to warn that semantics may change.

Fixes #35933

Remove naming styles before generating field/property/parameter in constructor related refactorings (#36220)

* Fix for 35776

* helper struct implemented

* Respond to feedback

* Tests in progress

* Add tests

* fix tests

* fix tests

* Respond to feedback

* Handle empty base names

* Add test for recursive removal of prefixes, and other minor feedback responses

* Fix tests