Blitzkrieg 1.8.0

A slick new command and new potentials unlocked.

Changes

• Added /ping
  • Allows you to see if the bot and Blitz are alive
• Added custom periods for /stats
  • To do this, /stats received two sub command groups: /stats player and /stats tank (hence merging the two)
  • All periods, including cusotm ones, now live as subcommands
• Added tier weights to /stats
• Added /evolution
  • Shows your winrate and battles over a period

Fixes

• Infinity and NaN values now show up as -- in /stats
• WN8 shortcomings in /eligible now rounds to nearest integer
• Average tiers now, once again, show up in /stats

Technical Changes

• Dev command names are implemented centrally in interactionCreated
• Abstracted the renderers of /stats, /evolution, and /today
• The bot now logs the number of server it's in on start up