The project snapshot now maintains a RazorProjectEngine as well as set
of Tag Helpers that are known for that snapshot.
Pivoted some more services to be snapshot-centric.
Also added the ability to track .cshtml documents to the project system.
For now most components just ignore document changes.
- Lifted `DefaultEditorSettingsManagerInternal`s state / event handling functionality into its `DefaultEditorSettingsManager`.
- Re-purposed `EditorSettingsManagerInternal` into a less-API heavy middleman `WorkspaceEditorSettings` for any workspace services concerned with editor settings to consume.
- Moved `DefaultEditorSettingsManagerInternal` into the Editor.Razor assembly and renamed it to `DefaultWorkspaceEditorSettings` since it needed the `EditorSettingsManager` API to function properly. The contract still exists at the `CodeAnalysis.Razor.Workspace` level.
#1982
- Created a new `TestWorkspace` type to lock on `AdhocWorkspace` construction. This type can't be constructed/changed in parallel.
- Updated test usages of `AdhocWorkspace` to make use of `TestWorkspace`.
- Added a `Microsoft.CodeAnalysis.Razor.Workspaces.Test.Common` project to have the `TestWorkspace` type.
#1913
- Added a `FileChangeTracker`, `FileChangeTrackerFactory` and corresponding implementations. These types now enable us to implement Windows and Mac file change tracking instead of replacing the entire import manager.
- Changed the import manager to be a Roslyn based service.
- Moved import manager implementation to the editor.razor assembly now since it no longer depends on windows.
- Updated import manager unit tests.
- Added import manager integration test
- Added file change tracking tests.
#1804