Create test asset overlay

This is a Work-in-Progress, merged current master and some non-trivial merging issues and stylistic touch-ups need to be applied.

src/features/player/MasonryGrid.jsx

@@ -11,6 +11,8 @@ function MasonryGrid({ sourceUrl, debugSettings, streamingSettings }) {
   const masonrySettings = useSettingsDisplayItems();
 
   const [player] = React.useState(dashjs.MediaPlayer().create);
+  // expose player in window to debug
+  window.player = player;
 
   return (
     <Form>
@@ -24,7 +26,7 @@ function MasonryGrid({ sourceUrl, debugSettings, streamingSettings }) {
           />
         </XBlock>
         <XBlock key="log" width={2}>
-          {/*<Log player={player} />*/}
+          <Log player={player} />
         </XBlock>
         {masonrySettings.map(masonryItem => (
           <XBlock key={masonryItem.info.name}>