nodes: use flag instead of hidden array in factory

app/node/generator/text/textv1.cpp

@@ -53,6 +53,8 @@ TextGeneratorV1::TextGeneratorV1()
   AddInput(kFontInput, NodeValue::kFont);
 
   AddInput(kFontSizeInput, NodeValue::kFloat, 72.0f);
+
+  SetFlags(kDontShowInCreateMenu);
 }
 
 QString TextGeneratorV1::Name() const

app/node/generator/text/textv2.cpp

@@ -57,6 +57,8 @@ TextGeneratorV2::TextGeneratorV2()
 
   SetStandardValue(kColorInput, QVariant::fromValue(Color(1.0f, 1.0f, 1.0)));
   SetStandardValue(kSizeInput, QVector2D(400, 300));
+
+  SetFlags(kDontShowInCreateMenu);
 }
 
 QString TextGeneratorV2::Name() const