Implement a restrictions for commands

[purrplingcat]

Checking user is allowed for exec command now is defined by flag 'restricted'

cmd = {
  "description": "Admin cmd",
  "usage": "<user>",
  "botAdminOnly": false
  "restrictions:" "MSG_EDIT"
}

This command CAN run only user with permision MSG_EDIT. You can define mopre restrictions via Array: [ "KICK_MEMBERS", "BAN_MEMBERS" ]

If flag botAdminOnly is true, then command can run only user who's a BOT ADMINISTRATOR. This flag overrides restrictions definition.

Commands, who is for @everyone has set 'restricted' to FALSE or has not set it.