* render direction arrow for group entities, having angle/angles key set or having angle/angles/direction attribute in .ent

draw condition relies on entity.getKeyValue, which also provides default values; thus removed default "0" for all group entities in .def loader
mind to add entity.getOnlySpecifiedKeyValue func or perform by visitor?

radiant/entityinspector.cpp

@@ -534,6 +534,7 @@ void update(){
 	}
 	else
 	{
+		radio_button_set_active_no_signal( m_radio.m_radio, 2 );
 		gtk_entry_set_text( m_entry, "0" );
 	}
 }