The goal of this new class is to simplifie the arguments parsing,
I've take inspiration from glib Commandline option parser:
https://developer.gnome.org/glib/stable/glib-Commandline-option-parser.html,
exept that with glib you need to specifie with a flag the type of each options,
here options type are automatically determine when adding an option
with parser.addOption.

Basically most of the job is made in the parser contructor, here you can
set the name of the program, summary, and arguments that are not options.

Option like "--nwm" are set with addOption function.
"--help" is automatically generated with arguments you've use in
addOption and in the contructor, "--version" is generated too, and
call Version::printVersion.

In this file, "Usage: xml2ssf [<options>] [<input file>] <output file>"
change to
"Usage: ./bin/xml2ssf [<options>] <[input file] <output file>>".

I had to use an array of stings to get input file and output file,
this is because input file is the optinal argument and is before ouput file,
I would be harder to handle this case automatically in cli.h, as I would need to
check if there is non optinal argument after the optinal one.

I could do that, but as this file is the only one that need that, I don't think
it worth the effort so I just get all arguments in a vector,
and let some bytes of the old parser do what's left of the job

Signed-off-by: Matthias Gatto <uso.cosmo.ray@gmail.com>