change the order of controls inside a container
I already asked this question on [stackoverflow link](https://stackoverflow.com/questions/72423748/realign-controls-inside-a-layout-in-nigui).
How can I change order of controls inside a container without rebuilding entire layout with new order? since that controls are saved inside a `seq`, I think we should be able to manipulate the order of them.

and two more question, 
is there `Grid` layout in `NiGui`?
has `NiGui` written in pure `Nim`? and if not, why not?

Thank you