Polls part 1 - displaying in timelines and voting (#1200)

* add entity classes

* change data models and add database migration

* add polls to StatusViewData

* show poll results

* add methods for vote handling

* add voting interface

* enable voting in TimelineFragment

* update polls immediately

* enable custom emojis for poll options

* enable voting from search fragment

* add voting layout to detailed statuses

* fix tests

* enable voting in ViewThreadFragment

* enable voting in ConversationsFragment

* small refactor for StatusBaseViewHolder

app/src/main/java/com/keylesspalace/tusky/interfaces/StatusActionListener.java

@@ -17,6 +17,8 @@ package com.keylesspalace.tusky.interfaces;
 
 import android.view.View;
 
+import java.util.List;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
@@ -58,4 +60,6 @@ public interface StatusActionListener extends LinkListener {
      */
     default void onShowFavs(int position) {}
 
+    void onVoteInPoll(int position, @NonNull List<Integer> choices);
+
 }