Personal Details and modal refactoring

- Moved requestTraveller form type into its own page since every wizard step is separate now
- Made primary button of modal window disabled on click, so that multiple clicks don't execute the handler code more than once
- Adjusted add methods of requestCtrl to not clone a default copy to avoid reference issues
- Adjusted remove methods of requestCtrl to delete an item by identity instead of index to avoid accidentally removing items by clicking more than once