Add a "base" `Dialog` and `ConfirmDialog` components

[agarny]

Right now, our AboutDialog and ResetAllDialog components each hide and show our menu as needed. However, this means that the day we need a new Dialog or ConfirmDialog based component, we will have to remember this and show our menu as needed too, which is not ideal since error prone.

So, we need a "base" Dialog and ConfirmDialog component that hides/shows our menu, so that any new Dialog or ConfirmDialog based component that inherits from it will automatically hide/show our menu free of charge.