remove unused resources

Closes #2594

//FREEBIE

res/layout/conversation_list_item_view.xml

@@ -59,14 +59,6 @@
                       tools:text="Jules Bonnot"
                       android:ellipsize="marquee" />
 
-            <ImageView android:id="@+id/attachment"
-                       android:layout_marginLeft="3dip"
-                       android:layout_height="match_parent"
-                       android:layout_width="20sp"
-                       android:visibility="gone"
-                       android:src="@drawable/ic_attachment_universal_small"
-                       android:contentDescription="@string/conversation_list_item_view__attachment_indicator" />
-
             <ImageView android:id="@+id/error"
                        android:layout_marginLeft="3dip"
                        android:layout_height="match_parent"

res/values/strings.xml

@@ -478,7 +478,6 @@
     <!-- conversation_item -->
     <string name="conversation_item__mms_downloading_description">Media message downloading</string>
     <string name="conversation_item__mms_image_description">Media message</string>
-    <string name="conversation_item__play_button_description">Play button</string>
     <string name="conversation_item__secure_message_description">Secure message</string>
 
     <!-- conversation_item_sent -->
@@ -838,7 +837,6 @@
 
     <!-- conversation_list_item_view -->
     <string name="conversation_list_item_view__contact_photo_image">Contact Photo Image</string>
-    <string name="conversation_list_item_view__attachment_indicator">Attachment Indicator</string>
     <string name="conversation_list_item_view__error_alert">Error alert</string>
 
     <!-- conversation_list_fragment -->