nodes: rework so that jobs can be completely deferred

Big optimization requiring a lot of refactoring.

app/node/generator/text/textv1.cpp

@@ -92,11 +92,8 @@ void TextGeneratorV1::Retranslate()
 
 void TextGeneratorV1::Value(const NodeValueRow &value, const NodeGlobals &globals, NodeValueTable *table) const
 {
-  GenerateJob job;
-  job.Insert(value);
-
-  if (!job.Get(kTextInput).toString().isEmpty()) {
-    table->Push(NodeValue::kTexture, QVariant::fromValue(job), this);
+  if (!value[kTextInput].toString().isEmpty()) {
+    table->Push(NodeValue::kTexture, Texture::Job(globals.vparams(), GenerateJob(value)), this);
   }
 }