JS: Deprecate forward/backward exploration modules

Author: asgerf

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

@@ -1,5 +1,6 @@
 /**
  * Alias for the library `semmle.javascript.explore.BackwardDataFlow`.
  */
+deprecated module;
 
 import semmle.javascript.explore.BackwardDataFlow

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

@@ -1,5 +1,6 @@
 /**
  * Alias for the library `semmle.javascript.explore.ForwardDataFlow`.
  */
+deprecated module;
 
 import semmle.javascript.explore.ForwardDataFlow

javascript/ql/lib/semmle/javascript/explore/BackwardDataFlow.qll

@@ -12,10 +12,11 @@
  * Backward exploration in particular does not scale on non-trivial code bases and hence is of limited
  * usefulness as it stands.
  */
+deprecated module;
 
 import javascript
 
-private class BackwardExploringConfiguration extends DataFlow::Configuration {
+deprecated private class BackwardExploringConfiguration extends DataFlow::Configuration {
   BackwardExploringConfiguration() { this = any(DataFlow::Configuration cfg) }
 
   override predicate isSource(DataFlow::Node node) { any() }

javascript/ql/lib/semmle/javascript/explore/ForwardDataFlow.qll

@@ -10,10 +10,11 @@
  *
  * NOTE: This library should only be used for debugging and exploration, not in production code.
  */
+deprecated module;
 
 import javascript
 
-private class ForwardExploringConfiguration extends DataFlow::Configuration {
+deprecated private class ForwardExploringConfiguration extends DataFlow::Configuration {
   ForwardExploringConfiguration() { this = any(DataFlow::Configuration cfg) }
 
   override predicate isSink(DataFlow::Node node) { any() }