* `G90DeviceNotifications` now handles both SOS initiated by the panel
  (host) and from the remote. Also, the class now processes button presses
  on the remote. To implement the functionality new methods `on_sos` and
  `on_remote_button_press` were added to the class
* `G90History` now correctly handles events associated with SOS and remote
  button presses
* `G90Alarm` now has user-visible callbacks for SOS and remote button presses,
   with two new properties to set the callbacks, `sos_callback` and `remote_button_press_callback`,
   respecitvely.

   The `on_sos` callaback invokes the `on_alarm` callback as well, since the SOS
   is treated as an alarm. Also, `on_remote_button_press` is invoked for the remote
   under SOS condition, so that the callback is called for all remote buttons including
   SOS.

   The `on_remote_button_press` one also invokes the `on_sensor_activity` callback,
   since the remote is treated as a special type of sensor.