Retrieves SRTM data

Retrieves SRTM data (Hgt files) from NASA Free FTP Servers, Unzips the data, moves that data into a 2D Array, Creates a 2nd 2D Array for storing Colors and apply shades, draw the map in Screen and allows the user to save the image. the map can be any peace of earth in the world, the user selects by clicking the desired SRTM Cell and each cell coordinates are shown on screen.

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