nodes: optimize job infrastructure

Rework traversing so that jobs are only resolved when they are used. This should provide moderate optimize to the traversing process.

app/node/value.h

@@ -172,42 +172,6 @@ public:
      */
     kAudioParams,
 
-    /**
-     * Job type
-     *
-     * An internal type used to indicate to the renderer that a footage job needs to
-     * run. This value will usually be taken from a table and a kTexture or kSamples value will be
-     * pushed to take its place.
-     */
-    kFootageJob,
-
-    /**
-     * Job type
-     *
-     * An internal type used to indicate to the renderer that an accelerated shader job needs to
-     * run. This value will usually be taken from a table and a kTexture value will be pushed to
-     * take its place.
-     */
-    kShaderJob,
-
-    /**
-     * Job type
-     *
-     * An internal type used to indicate to the renderer that an accelerated sample job needs to
-     * take place. This value will usually be taken from a table and a kSamples value will be
-     * pushed to take its place.
-     */
-    kSampleJob,
-
-    /**
-     * Job type
-     *
-     * An internal type used to indicate to the renderer that an accelerated sample job needs to
-     * take place. This value will usually be taken from a table and a kSamples value will be
-     * pushed to take its place.
-     */
-    kGenerateJob,
-
     /**
      * End of list
      */
@@ -244,6 +208,11 @@ public:
     return data_;
   }
 
+  void set_data(const QVariant& data)
+  {
+    data_ = data;
+  }
+
   const QString& tag() const
   {
     return tag_;