Kill Service Preference, CDMA update and Main Display tweaks

Preference added to kill the background service when quitting the application.

CDMA specific updates to include further details such as System ID, Base Station ID, Network ID and Longitude/Latitude.

Main layout updated to display device specific information.
OpenCellID enabled

Downloading of OpenCellID data will display markers for identified cell towers and their CellID
within 100km of the current location, this is basically to test functionality of this API full
data provided by OpenCellID is: lat,lon,mcc,mnc,lac,cellid,averageSignalStrength,samples,changeable

This functionality could be easily applied to different APIs offered by other organisations,
this could be helpful when comparing existing cell data to confirmed information (how accurate??)
to assist in making a decision regarding IMSI Catcher detection.

CSV file of details is stored on external storage along with the database table export files,
further options can be included to load any found details when the MapViewer is loaded.