[FEATURE] added multiple pools environment

- added multipool environment to add more pools to the bot
- changed the syntax for commands

insert pools like this

dict set pools ltc apiurl     "https://pool2.tld/"
dict set pools ltc apikey     "YOURMPOSAPIKEY"

commands now work like this
-> !round LTC (where LTC is the var used in set pools)
will show the round stats for your LTC pool

same for user stats
-> !user LTC username
will show the user stats for the specified pool