plugin XEP-0384: Implementation of Automatic Trust Management:

- Implementation of Trust Messages (XEP-0434)
- Implementation of Automatic Trust Management (XEP-0450)
- Implementations directly as part of the OMEMO plugin, since omemo:2 is the only protocol supported by ATM at the moment
- Trust system selection updated to allow choice between manual trust with ATM and BTBV
- dev-requirements.txt updated to include additional requirements for the e2e tests

fix 376

sat/tools/xml_tools.py

@@ -20,7 +20,7 @@
 from collections import OrderedDict
 import html.entities
 import re
-from typing import Optional, Tuple, Union, Literal, overload
+from typing import Dict, Optional, Tuple, Union, Literal, overload
 from xml.dom import NotFoundErr, minidom
 import xml.etree.ElementTree as ET
 from lxml import etree
@@ -2030,3 +2030,37 @@ def domish_elt_2_et_elt(elt, lxml = False):
     for child in elt.elements():
         et_elt.append(domish_elt_2_et_elt(child, lxml=lxml))
     return et_elt
+
+
+def domish_elt_2_et_elt2(element: domish.Element) -> ET.Element:
+    """
+    WIP, originally from the OMEMO plugin
+    """
+
+    element_name = element.name
+    if element.uri is not None:
+        element_name = "{" + element.uri + "}" + element_name
+
+    attrib: Dict[str, str] = {}
+    for qname, value in element.attributes.items():
+        attribute_name = qname[1] if isinstance(qname, tuple) else qname
+        attribute_namespace = qname[0] if isinstance(qname, tuple) else None
+        if attribute_namespace is not None:
+            attribute_name = "{" + attribute_namespace + "}" + attribute_name
+
+        attrib[attribute_name] = value
+
+    result = ET.Element(element_name, attrib)
+
+    last_child: Optional[ET.Element] = None
+    for child in element.children:
+        if isinstance(child, str):
+            if last_child is None:
+                result.text = child
+            else:
+                last_child.tail = child
+        else:
+            last_child = domish_elt_2_et_elt2(child)
+            result.append(last_child)
+
+    return result