finished moving field data retrieving to row

nodes/inputs/stringinput.cpp

@@ -0,0 +1,12 @@
+#include "stringinput.h"
+
+StringInput::StringInput(Effect* parent, const QString& id, const QString& name, bool rich_text, bool savable, bool keyframable) :
+  EffectRow(parent, id, name, savable, keyframable)
+{
+  AddField(new StringField(this, rich_text));
+}
+
+QString StringInput::GetStringAt(double timecode)
+{
+  return static_cast<StringField*>(Field(0))->GetStringAt(timecode);
+}