Add support for Hexagram30 Dice Roller

[oubiwann]

Dev tasks:

• [x] Add top-level roll command
• [x] Add ping subcommand
• [x] Add version subcommand
• [x] Add meta subcommand
• [x] Add arg-parsing support for all types of rolls
• [ ] Handle all old CLI usage (see https://github.com/hexagram30/dice/issues/9)
  • [x] hxgm30 roll <dice-type> (method Roll)- a single roll
  • [x] hxgm30 roll <dice-type> <count>(method RollN) - multiple roles of a single type of dice
  • [x] hxgm30 roll <dice-type> <count> [<dice-type> <count> ...] (method RollVarious) - multiple rolls supporting different types of dice
  • [x] hxgm30 roll meta <dice-type> <count>(method RollNMeta) - multiple rolls of a single type of dice with stats included in the results
  • [ ] hxgm30 roll meta <dice-type> <count> [<dice-type> <count> ...] (method RollVariousMeta) - multiple rolls supporting different types of dice with stats included in the results

[oubiwann]

Hrm, I think this work is done, now; need to double-check ...