VarAction2: Add support for more varaction2 types

Add CB failure and deterministic relative types

src/newgrf_extension.cpp

@@ -65,6 +65,7 @@ extern const GRFFeatureInfo _grf_feature_list[] = {
 	GRFFeatureInfo("town_feature", 1),
 	GRFFeatureInfo("town_uncapped_variables", 1),
 	GRFFeatureInfo("town_zone_callback", 1, GFTOF_TOWN_ZONE_CALLBACK),
+	GRFFeatureInfo("more_varaction2_types", 1, GFTOF_MORE_VARACTION2_TYPES),
 	GRFFeatureInfo(),
 };