Added stopsignal module with checkDependency and addStopSignal definitions

core/runtime/stopsignals.py

@@ -0,0 +1,17 @@
+def checkDependency(action, outputs):
+    if hasattr(action, "depends"):
+        stop = any(
+                dependency in outputs["stopsignals"]
+                for dependency in action.depends
+            )
+        
+        if stop:
+            return True
+
+    return False
+
+def addStopSignal(action, outputs):
+    if hasattr(action, "depends"):
+        outputs["stopsignals"].append(action.alias)
+
+    return outputs