rewrite threads with Kotlin & coroutines (#2617)

* initial class setup

* handle events and filters

* handle status state changes

* code formatting

* fix status filtering

* cleanup code a bit

* implement removeAllByAccountId

* move toolbar into fragment, implement menu

* error and load state handling

* fix pull to refresh

* implement reveal button

* use requireContext() instead of context!!

* jump to detailed status

* add ViewThreadViewModelTest

* fix ktlint

* small code improvements (thx charlag)

* add testcase for toggleRevealButton

* add more state change testcases to ViewThreadViewModel

app/src/main/res/layout/activity_view_thread.xml

@@ -2,12 +2,9 @@
 <androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    android:id="@+id/activity_view_thread"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context="com.keylesspalace.tusky.ViewThreadActivity">
-
-    <include layout="@layout/toolbar_basic" />
+    tools:context="com.keylesspalace.tusky.components.viewthread.ViewThreadActivity">
 
     <androidx.fragment.app.FragmentContainerView
         android:id="@+id/fragment_container"