- Changed `ReparseAsync` to be `QueueReparse`. It's now async void to not give the misconception that it blocks until a reparse has been completed.
- Removed `IContextChangedListener`. People can get the same effect of the interface by retrieving the document tracker interface via the `RazorEditorFactoryService` and then when its context changes getting the parser.
- Exposed `TryGetParser` to aid in replacing `IContextChangedListener`.
- Updated tests to not rely on `IContextChangedListener`.
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