Asteroid Alert

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BUGS: (1) Fixed bug regarding persistent notifications, (2) Increased overall stability. IMPROVEMENTS: (1) The notifications can be cancelled from notification bar, (2) Overall optimizations, (3) New 3D graphics interface, (4) Added the sky view mode to view the NEOs in the sky, (5) It supports device sensors for 3D orientation and NEO targeting (6) It calculates the spherical coordinates of selected NEOs. The point 4 requires the GPS permission grant.