JS: Rename FlowSteps::callback -> exploratoryCallbackStep

Author: asgerf

javascript/ql/lib/semmle/javascript/dataflow/Configuration.qll

@@ -947,7 +947,7 @@ private predicate exploratoryFlowStep(
   isAdditionalLoadStoreStep(pred, succ, _, _, cfg) or
   // the following three disjuncts taken together over-approximate flow through
   // higher-order calls
-  callback(pred, succ) or
+  exploratoryCallbackStep(pred, succ) or
   succ = pred.(DataFlow::FunctionNode).getAParameter() or
   exploratoryBoundInvokeStep(pred, succ)
 }

javascript/ql/lib/semmle/javascript/dataflow/TrackedNodes.qll

@@ -154,7 +154,7 @@ private module NodeTracking {
       or
       basicLoadStep(mid, nd, _)
       or
-      callback(mid, nd)
+      exploratoryCallbackStep(mid, nd)
       or
       nd = mid.(DataFlow::FunctionNode).getAParameter()
     )

javascript/ql/lib/semmle/javascript/dataflow/internal/FlowSteps.qll

@@ -434,7 +434,7 @@ private module CachedSteps {
    * invocation.
    */
   cached
-  predicate callback(DataFlow::Node arg, DataFlow::SourceNode cb) {
+  predicate exploratoryCallbackStep(DataFlow::Node arg, DataFlow::SourceNode cb) {
     Stages::TypeTracking::ref() and
     exists(DataFlow::InvokeNode invk, DataFlow::ParameterNode cbParm, DataFlow::Node cbArg |
       arg = invk.getAnArgument() and
@@ -444,7 +444,7 @@ private module CachedSteps {
     )
     or
     exists(DataFlow::ParameterNode cbParm, DataFlow::Node cbArg |
-      callback(arg, cbParm) and
+      exploratoryCallbackStep(arg, cbParm) and
       callStep(cbArg, cbParm) and
       cb.flowsTo(cbArg)
     )