Minor fix - check if particular device exists in database before reading its data.
Notification shell implemented
Added new field, _deviceName, with its getter and setter methods.
Device name field is initiated to empty string.
Added _usbDevice field with additional methods, representing Android's USB interface with the device.
Added c-tor with argument of UsbDevice type.
Using new AvrRecorderDevice c-tor (with UsbDevice object as arguement)
Changed type of idSession to long
Changed type of idTouchable to long
Implemented onRecordsRead - upon data read completion, all data is being saved onto database, notification gets created, and is being linked to session details activity.