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Initializes a [CLLocation] from a JSON string at a given filePath.
The JSON string must conform to the following structure: [{
latitude
: 37.8, // latitude or latlongitude
: -122.4 // longitude, lng, or lonverticalAccuracy
: 4,speed
: 21.0horizontalAccuracy
: 5,course
: 0.48timestamp
: 1497475447, // timestamp as unix timestamp or ISO8601Datealtitude
: 57.26 }]