Python: Refactor Dill.qll

So it matches the layout of all our other qll modules modeling a PyPI
package.

Author: RasmusWL

python/ql/lib/semmle/python/frameworks/Dill.qll

@@ -1,5 +1,5 @@
 /**
- * Provides classes modeling security-relevant aspects of the 'dill' package.
+ * Provides classes modeling security-relevant aspects of the `dill` PyPI package.
  * See https://pypi.org/project/dill/.
  */
 
@@ -10,18 +10,24 @@ private import semmle.python.Concepts
 private import semmle.python.ApiGraphs
 
 /**
- * A call to `dill.loads`
- * See https://pypi.org/project/dill/ (which currently refers you
- * to https://docs.python.org/3/library/pickle.html#pickle.loads)
+ * Provides models for the `dill` PyPI package.
+ * See https://pypi.org/project/dill/.
  */
-private class DillLoadsCall extends Decoding::Range, DataFlow::CallCfgNode {
-  DillLoadsCall() { this = API::moduleImport("dill").getMember("loads").getACall() }
+private module Dill {
+  /**
+   * A call to `dill.loads`
+   * See https://pypi.org/project/dill/ (which currently refers you
+   * to https://docs.python.org/3/library/pickle.html#pickle.loads)
+   */
+  private class DillLoadsCall extends Decoding::Range, DataFlow::CallCfgNode {
+    DillLoadsCall() { this = API::moduleImport("dill").getMember("loads").getACall() }
 
-  override predicate mayExecuteInput() { any() }
+    override predicate mayExecuteInput() { any() }
 
-  override DataFlow::Node getAnInput() { result = this.getArg(0) }
+    override DataFlow::Node getAnInput() { result = this.getArg(0) }
 
-  override DataFlow::Node getOutput() { result = this }
+    override DataFlow::Node getOutput() { result = this }
 
-  override string getFormat() { result = "dill" }
+    override string getFormat() { result = "dill" }
+  }
 }