Some smaller UI changes and else:

- added play video button for better lefthand support
 - wrote codepart to darkon5s listitem improvements
 - set minimum api level to 15 (Android 4.0.3 support)
 - updated to sdk level 23 including the new support libs

app/src/main/java/org/schabi/newpipe/VideoInfoItem.java

@@ -30,4 +30,5 @@ public class VideoInfoItem {
     public String thumbnail_url = "";
     public Bitmap thumbnail = null;
     public String webpage_url = "";
+    public String upload_date = "";
 }