This program reads a bmp file and a data file, and combines the two into a new bmp with the data embedded inside it.

Usage: ./imgcrypt <-e|-d> source.bmp file [dest.bmp]
        -e : Hides the contet of file in source.bmp, creating dest.bmp
        -d : Recovers the contents of a file hidden in source.bmp, and writes them to file