Advanced privilege system

[basicxman]

Commands should be able to manipulate a more advanced per-user privilege system, for example an op should be able to remove a users privileges to giving him or herself TNT.

[basicxman]

!block Ian_zers tnt
!block Ian_zers give
!grant Ian_zers day
!grant Ian_zers tnt

Have a data structure containing explicit blocks and grants.

{
  "Ian_zers" => {
    :commands => [[:day, :grant]],
    :items => [[46, :block]]
  }
}