-Changed thumbnail toggle in disabled mode to load dark dummy image.

-Changed play queue items to display service names.
-Fixed Soundcloud playlist not fitting thumbnail.
-Refactored image display options to follow uniform behavior.
-Refactoring and style changes on audio reactor and media button receiver.

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

@@ -19,7 +19,7 @@
         android:layout_alignParentTop="true"
         android:layout_marginRight="@dimen/video_item_search_image_right_margin"
         android:contentDescription="@string/list_thumbnail_view_description"
-        android:scaleType="fitEnd"
+        android:scaleType="centerCrop"
         android:src="@drawable/dummy_thumbnail_playlist"
         tools:ignore="RtlHardcoded"/>
 

app/src/main/res/values/strings.xml

@@ -75,7 +75,8 @@
     <string name="use_inexact_seek_title">Use fast inexact seek</string>
     <string name="use_inexact_seek_summary">Inexact seek allows the player to seek to positions faster with reduced precision</string>
     <string name="download_thumbnail_title">Load thumbnails</string>
-    <string name="download_thumbnail_summary">Disable to stop all non-cached thumbnail from loading and save on data and memory usage</string>
+    <string name="download_thumbnail_summary">Disable to stop all thumbnails from loading and save on data and memory usage. Changing this will clear both in-memory and on-disk image cache.</string>
+    <string name="thumbnail_cache_wipe_complete_notice">Image cache wiped</string>
     <string name="metadata_cache_wipe_title">Wipe cached metadata</string>
     <string name="metadata_cache_wipe_summary">Remove all cached webpage data</string>
     <string name="metadata_cache_wipe_complete_notice">Metadata cache wiped</string>