Add real GPS input

[PinaGruden]

• [x] Find GPS files for HICEAS 2017
• [x] Create a function that reads GPS data for the time that matches TDOA tracks
• [x] Use to infer hydrophone positions

[PinaGruden]

• Found gps info table
• Interpolating gps positions to match sampling of TDOAs

[PinaGruden]

Done! Function GetGPSandPhonePositions.m creates a table with boat and sensor positions for the specified encounter.