Version 7.0.0

### 7.0.0:
-   Changes
    - General (iOS): iOS SDKs are now built using Xcode 11.7.
    - App (Editor): Remove deprecated service account APIs.
    - App: Remove `FirebaseApp.CheckDependencies()` API.
    - Analytics: Remove deprecated SetMinimumSessionDuration call.
    - Installations: Added Installations SDK. See [Documentations](http://firebase.google.com/docs/reference/unity/namespace/firebase/installations) for
      details.
    - Instance Id: Marked Instance Id as deprecated.
    - Messaging: Added getToken, deleteToken apis.
    - Messaging: Removed deprecated Send() function.
    - Storage: Remove deprecated `DownloadUrl` and `DownloadUrls` properties in
      `StorageMetadata`.
    - Messaging: raw_data has been changed from a std::string to a byte array.
    - Dynamic Links: Remove deprecated `DynamicLinkComponents.DynamicLinkDomain`
      . Please use `DynamicLinkComponents.DomainUriPrefix` instead.
    - Dynamic Links (Android): Bump up Android library version and remove
      dependency to GMS app invite.
    - Firestore: Added support for `WhereNotEqualTo` and `WhereNotIn` queries.
    - Firestore: Added new internal HTTP headers to the gRPC connection.
    - Firestore: Fixed a Unity Editor hang on Windows when restarting an app
      after listening to a query, document, or snapshots in sync
      ([#845](https://github.com/firebase/quickstart-unity/issues/845)).
    - Firestore: Added support for `FirebaseFirestoreSettings.CacheSizeBytes`.
    - Firestore: Fixed an intermittent crash in the Unity Editor when the app is
      restarted while a transaction is in progress
      ([#783](https://github.com/firebase/quickstart-unity/issues/783)).
    - Firestore: Fixed a crash when writing to a document after having been
      offline for long enough that the auth token expired
      ([#872](https://github.com/firebase/quickstart-unity/issues/872)).