Adding to mhwd the version option

Merged Philip Müller requested to merge filipe-marques:development into development

Created by: filipe-marques

Hi! I add to mhwd the version option, in the menu the options -v or --version, and created the necessary member functions. I also add a member function to set the version and copyright more easily in main.cpp, that then will show up, if the user request to show version. With the version and copyright also the user see what is the license. Added to source files my name and email and also in authors file. In todo file, could someone explain in more detail, what is to do? Because the list is unconcise.

Thanks!

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