Support for an audio view to allow in-app playback of audio.

Closes #4270
// FREEBIE

src/org/thoughtcrime/securesms/BindableConversationItem.java

@@ -4,6 +4,7 @@ import android.support.annotation.NonNull;
 
 import org.thoughtcrime.securesms.crypto.MasterSecret;
 import org.thoughtcrime.securesms.database.model.MessageRecord;
+import org.thoughtcrime.securesms.recipients.Recipients;
 
 import java.util.Locale;
 import java.util.Set;
@@ -13,5 +14,5 @@ public interface BindableConversationItem extends Unbindable {
             @NonNull MessageRecord messageRecord,
             @NonNull Locale locale,
             @NonNull Set<MessageRecord> batchSelected,
-            boolean groupThread);
+            @NonNull Recipients recipients);
 }