Geographical position retreive/compare/display

[cynkiller]

• Get user location permission
• Get current location (through wx api)
• Get destination location
• Timely update location
• Distance calculation
• Rectangular coordinates translation ( mars <-> gps)
• Valid distance judgement

[cynkiller]

Function added in 847cefd7aa601a938c25894aaa17a12bd113c072 05649ff0f85fd07d33d890efd292525fc0dd4f9d e9c5841c0b7996441b428e74c6018ca75b19370e