Decide the strategy for passing (command-line) options

[lucabaldini]

We have three options

• http://doc.qt.io/qt-4.8/qvariant.html
• http://www.boost.org/doc/libs/1_58_0/doc/html/program_options.html
• https://bitbucket.org/lbaldini/eee/src/af5a2f467ff0a1d3a559ce54209e303f0e83bfd6/src/E3Variant.h?at=default&fileviewer=file-view-default

[lucabaldini]

I just committed a few classes toward solution 3.

[lucabaldini]

I believe this is settled for the time being---we're already using our custom classes in most applications.