core (memory/param): Replace warning sign in ASCII by emoji:

The warning sign in ASCII should be escaped, but that doesn't play well with docstrings.
Emoji is a better option.

libervia/backend/memory/params.py

@@ -397,7 +397,7 @@ class Params(object):
     def _get_attr_internal(self, node, attr, value):
         """Get attribute value.
 
-        /!\ This method would return encrypted password values.
+        ⚠️This method would return encrypted password values.
 
         @param node: XML param node
         @param attr: name of the attribute to get (e.g.: 'value' or 'type')
@@ -479,7 +479,7 @@ class Params(object):
     def _get_attr(self, node, attr, value):
         """Get attribute value (synchronous).
 
-        /!\ This method can not be used to retrieve password values.
+        ⚠️This method can not be used to retrieve password values.
         @param node: XML param node
         @param attr: name of the attribute to get (e.g.: 'value' or 'type')
         @param value: user defined value
@@ -543,7 +543,7 @@ class Params(object):
     ):
         """Helper method to get a specific attribute.
 
-        /!\ This method would return encrypted password values,
+        ⚠️This method would return encrypted password values,
             to get the plain values you have to use param_get_a_async.
         @param name: name of the parameter
         @param category: category of the parameter
@@ -747,7 +747,7 @@ class Params(object):
     async def _construct_profile_xml(self, client, security_limit, app, extra):
         """Construct xml for asked profile, filling values when needed
 
-        /!\ as noticed in doc, don't forget to unlink the minidom.Document
+        ⚠️as noticed in doc, don't forget to unlink the minidom.Document
         @param security_limit: NO_SECURITY_LIMIT (-1) to return all the params.
         Otherwise sole the params which have a security level defined *and*
         lower or equal to the specified value are returned.