Introduced new properties:

- nabled
Specifies if badges are enabled when using push notifications for the OX Mail app for iOS.
These get displayed on the app icon.
Default is true

- nabled
Specifies if a sound should be played when the OX Mail app on iOS receives a push notification.
Default is true

- ilename
Specifies the filename of the sound to play when a push notification is received in the OX Mail app on iOS.
This file needs to be included in the app, otherwise a default sound is played. the string 'default' also causes
the default iOS sound to be played.
Default is 'default'

All properties are reloadable and configcascade-aware.