Remove rxjava from deletestatus API (#3041)

* Remove rxjava from API calls used by AccountListFragment

* Remove rxjava from API calls used by AccountViewModel::changeRelationship()

The affected API functions are also called from

- ReportViewModel.kt
- SearchViewModel.kt
- AccountListFragment.kt
- SFragment.java
- TimelineCases.kt

so they have also been updated.

This change requires bridging from Java code to Kotlin `suspend` functions,
by creating wrappers for the `mute` and `block` functions that can be
called from Java and create a coroutine scope.

I've deliberately made this fairly ugly so that it sticks out and can be
removed later.

* Use "Throwable" type and name

* Delete 46.json

Not sure where this came from.

* Remove rxjava from the deleteStatus call path

* Emit log messages with the correct tag

* Add another log tag, and lint

* Use TAG in log messages now it's present

* Lint

* Move viewModelScope.launch in to changeRelationshop()

* Use onSuccess/onFailure pair instead of fold

* Return Deferred when deleting statuses

app/src/main/java/com/keylesspalace/tusky/network/MastodonApi.kt

@@ -213,9 +213,9 @@ interface MastodonApi {
     ): Response<List<TimelineAccount>>
 
     @DELETE("api/v1/statuses/{id}")
-    fun deleteStatus(
+    suspend fun deleteStatus(
         @Path("id") statusId: String
-    ): Single<DeletedStatus>
+    ): NetworkResult<DeletedStatus>
 
     @POST("api/v1/statuses/{id}/reblog")
     fun reblogStatus(