Fix slowdowns in stream list views

Now the playback state of a stream is loaded only when needed (i.e. when the stream is visible), just as it is done with thumbnails.
Removed `StateObjectsListAdapter.java`, which used to load the state of every stream at list instantiation, generating slowdowns and freezes.

app/src/main/java/org/schabi/newpipe/fragments/list/BaseListFragment.java

@@ -64,7 +64,6 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
 
     @Override
     public void onDetach() {
-        infoListAdapter.dispose();
         super.onDetach();
     }
 
@@ -97,8 +96,6 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
             }
             updateFlags = 0;
         }
-
-        itemsList.post(infoListAdapter::updateStates);
     }
 
     /*//////////////////////////////////////////////////////////////////////////