added cli

added cli options for:
Usage: ./Evolve [options] filename
Polygon image evolver

Options:
-h, --help Displays this help.
-v, --version Displays version information.
-a, --accuracy Evolve until this accuracy is reached
-o, --output Output file, extension determines format, PNG by default
-c command line only (no gui)

Arguments:
filename Image file to imitate.

This needs debugging but the basics are there.