Enable auto sync on iOS app V1

In the AmigoCollect mobile application's Status view, there is a switch to enable auto sync. When enabled the AmigoCollect application will synchronize the data with the AmigoCloud backend right after the changes were made and a record's mobile form is closed. Also the synchronization will be triggered right away if changes were made in the cloud to the opened project. When this switch is off the sync will not be triggered automatically when changes are made. This option could be useful when collecting data in the field with bad, or intermittent connection, and synchronization is slow. Or when for some other reasons it is not desirable to trigger synchronization after each record's change on the mobile application, or in the cloud. Even when auto sync is off, synchronization still can be triggered manually by pulling down the dataset list.