Add option radarBBox

[E3V3A]

Add the config option radarBBox as an array of 2 Lat's and 2 Lon's.

// Google maps BoundingBox Limits are defined by 2 corner points: 
// SW and NE, whereas Flightradar24 API are using NW and SE corners!
//# radar(LatMax/North, LonMin/West, LatMin/South, LonMax/East)

Thus we need an NW-SE an array written as: [LatMax, LonMin, LatMin, LonMax], using decimal degrees.