node: fixed issue with "taking" values from input tables

As opposed to simply leaving all values in the table, nodes can now "take"
values that they use to free up memory (e.g. "taking" input buffers if they're
used to produce an output buffer).

This is a fairly large change, expect regressions.

app/node/traverser.cpp

@@ -72,7 +72,7 @@ NodeValueTable NodeTraverser::ProcessNode(const NodeDependency& dep)
   // By this point, the node should have all the inputs it needs to render correctly
   NodeValueTable table = node->Value(database);
 
-  ProcessNodeEvent(node, dep.range(), database, &table);
+  ProcessNodeEvent(node, dep.range(), database, table);
 
   return table;
 }