OCaml interface to r2

Interact with radare2, See the mli for documentation, example usage in utop:

require "radare2";;

let result = R2.with_command_j ~cmd:"/j COLUMNS" "/bin/ls";; val result : Yojson.t = List [Assoc

 [("offset", `Int 109075); ("type", `String "string");
  ("data", `String "eQUOTING_STYLECOLUMNSTABSIZEinvalid")];

Assoc [("offset", Int 118247); ("type", String "string"); ("data", String "onment variable COLUMNS: %signori")]]"