fix stroke preview, add license messages, fix node scroll

src/main.cpp

@@ -408,12 +408,14 @@ int main(int argc, char** argv)
     if (argc == 1)
         App::I.initLog();
 
+/*
     if (!App::I.check_license())
     {
         MessageBoxA(NULL, "Unable to verify this demo license, please make sure you are connected to Internet.",
             "PanoPainter - License Error", MB_ICONERROR | MB_OK);
         return -1;
     }
+*/
 
 
     FILE* fp_check = fopen("data\\layout.xml", "rb");