Renaming and preparing to remove oracles (#985)

A few references to oracles still remain, but they have been removed as a feature, at least.

Reviewed-on: #985
Reviewed-by: Ulf Wiger <ulfwiger@qpq.swiss>
Co-authored-by: Craig Everett <zxq9@zxq9.com>
Co-committed-by: Craig Everett <zxq9@zxq9.com>

test/contracts/unapplied_builtins.aes

@@ -1,16 +1,12 @@
 // Builtins without named arguments can appear unapplied.
 // Named argument builtins are:
-//    Oracle.register
-//    Oracle.respond
 //    AENSv2.preclaim
 //    AENSv2.claim
 //    AENSv2.transfer
 //    AENSv2.revoke
-//    Oracle.extend
 include "String.aes"
 contract UnappliedBuiltins =
   entrypoint main_fun() = ()
-  type o = oracle(int, int)
   type t = list(int * string)
   type m = map(int, int)
   datatype event = Event(int)
@@ -21,13 +17,6 @@ contract UnappliedBuiltins =
   function call_gas_left()               = Call.gas_left
   function b_abort()                     = abort
   function b_require()                   = require
-  function oracle_query_fee()            = Oracle.query_fee
-  function oracle_expiry()               = Oracle.expiry
-  stateful function oracle_query()       = Oracle.query        : (o, _, _, _, _) => _
-  function oracle_get_question()         = Oracle.get_question : (o, _) => _
-  function oracle_get_answer()           = Oracle.get_answer   : (o, _) => _
-  function oracle_check()                = Oracle.check        : o => _
-  function oracle_check_query()          = Oracle.check_query  : (o, _) => _
   function aens_resolve()                = AENSv2.resolve      : (_, _) => option(string)
   function map_lookup()                  = Map.lookup          : (_, m) => _
   function map_lookup_default()          = Map.lookup_default  : (_, m, _) => _
@@ -57,7 +46,6 @@ contract UnappliedBuiltins =
   function bits_sum()                    = Bits.sum
   function int_to_str()                  = Int.to_str
   function address_to_str()              = Address.to_str
-  function address_is_oracle()           = Address.is_oracle
   function address_is_contract()         = Address.is_contract
   function address_is_payable()          = Address.is_payable
   function bytes_to_int()                = Bytes.to_int : bytes(10) => int