added full rational class

nodes/nodeio.h

@@ -174,6 +174,16 @@ public:
    */
   bool IsKeyframable();
 
+  /**
+   * @brief Get value
+   *
+   * A convenience value for a parameters that doesn't keyframe. Equivalent to GetValueAt(0) where the parameter
+   * doesn't keyframe so the 0 is ignored.
+   *
+   * @param value
+   */
+  QVariant GetValue();
+
   /**
    * @brief Get value at a given timecode
    *
@@ -193,6 +203,16 @@ public:
    */
   virtual QVariant GetValueAt(double timecode);
 
+  /**
+   * @brief Set value
+   *
+   * A convenience value for a parameters that doesn't keyframe. Equivalent to SetValueAt(0, value) where the parameter
+   * doesn't keyframe so the 0 is ignored.
+   *
+   * @param value
+   */
+  void SetValue(const QVariant& value);
+
   /**
    * @brief SetValueAt
    *