[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 variable used in pools declaration)
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

NOTE
for checking new blocks on multiple pools set

set poolstocheck "POOL1 POOL2"

where POOL1 and POOL2 is the variable used in pools declaration