RFC: rewrite on top of Symfony console

[robbieaverill]

There are a number of issues logged on this repo which would be trivial to implement if sspak was written on top of the Symfony console component.

Benefits include:

• display the app version
• progress indication
• silent output options
• better handling of input arguments and options
• a common framework for console commands
• extensibility

It would require a major version bump (probably) and a fair amount of work, but probably worthwhile in the long run.

[dhensby]

Sure - I've thought this too - but it's just is the effort worth the return?

[robbieaverill]

In the long run it probably is, although it might be hard to see right now

[dhensby]

Yep - and there's the problem, does anyone have the time to do it now?

[dhensby]

I've kind of started this lightly here: https://github.com/dhensby/sspak/tree/pulls/symfony-console