[wgem] fix icon path definition and caching | param --reset cleaning the web environment as well

bauh/api/abstract/controller.py

@@ -265,3 +265,9 @@ class SoftwareManager(ABC):
         :return: screenshot urls for the given package
         """
         pass
+
+    def clear_data(self):
+        """
+        Removes all data created by the SoftwareManager instance
+        """
+        pass