Welcomr

* Synchronise access automatically when the app starts.
* Reduced time required to update data after pulling down the screen.
* Added a special icon to indicate that the user has not authorised remote access. By pressing this icon, an information message will be displayed.
* Changed the icon of remote capability.
* Corrected the error message displayed when user try to scan an QR code of reader.
* Fixed minor bugs to enhance user experience.