multithreaded download and files that probably should have been in the last

commit

For testing the new iteration, the texture cache disk download was written
into the main thread instead of into the separate threads. Now they're back
in separate threads again.

Also I think some of these files probably should have been in the previous
commit.

app/node/block/clip/clip.cpp

@@ -87,3 +87,12 @@ TimeRange ClipBlock::InputTimeAdjustment(NodeInput *input, const TimeRange &inpu
 
   return Block::InputTimeAdjustment(input, input_time);
 }
+
+QVariant ClipBlock::Value(NodeOutput *output)
+{
+  if (output == buffer_output()) {
+    // We just pass through the texture here, the renderer should have gotten the correct time from InputTimeAdjustment
+    return texture_input()->value();
+  }
+  return Block::Value(output);
+}