nodes: allow ignoring specific inputs for rendering

Also ignore sequence input on multicam

app/node/traverser.cpp

@@ -38,11 +38,16 @@ NodeValueDatabase NodeTraverser::GenerateDatabase(const Node* node, const TimeRa
   }
 
   // We need to insert tables into the database for each input
+  auto ignore = node->IgnoreInputsForRendering();
   foreach (const QString& input, node->inputs()) {
     if (IsCancelled()) {
       return NodeValueDatabase();
     }
 
+    if (ignore.contains(input)) {
+      continue;
+    }
+
     database.Insert(input, ProcessInput(node, input, range));
   }