Updates to work with latest Android 36

Added marketing Url

Improved error message when Compass calibration disabled

New, improved azimuth calculation.

Improved smoothing factor on azimuth to reduce satellite arc jerkiness.

Now using a new and improved algorithm to calculate azimuth.

Fixed magnetic declination data

Better Privacy Consent dialog.

Revised Data Consent and Privacy Policy to comply with EU GDPR regulation

Fixed a screenshot crash in iOS 11

Made layout adjustments for iPhone X

Changed the informational message about enabling Compass calibration in system settings.

Fixed Location services approval message.

Added EU user consent policy message

- added in-app purchase option to remove ads

Graphics speed improvements