Option to disable setting the url and adding to the history (e.g. for modals)

[robclouth]

It would be super handy to be able to disable adding to the history and setting the url for certain routes, for example dialogs and modals.

[robclouth]

For now I've moved all modals into a single router and return null for getPathAndParamsForState for the modal routes. This stops them getting added to the history and changing the url.

const originalFunction = ModalStack.router.getPathAndParamsForState;
(ModalStack.router as any).getPathAndParamsForState = (state: any) => {
  const currRoute = state.routes[state.index];
  if (currRoute.routeName === "MainSwitch") return originalFunction(state);
  else return null;
};