plugin XEP-0384: Fully reworked to adjust to the reworked python-omemo:

- support for both (modern) OMEMO under the `urn:xmpp:omemo:2` namespace and (legacy) OMEMO under the `eu.siacs.conversations.axolotl` namespace
- maintains one identity across both versions of OMEMO
- migrates data from the old plugin
- includes more features for protocol stability
- uses SCE for modern OMEMO
- fully type-checked, linted and format-checked
- added type hints to various pieces of backend code used by the plugin
- added stubs for some Twisted APIs used by the plugin under stubs/ (use `export MYPYPATH=stubs/` before running mypy)
- core (xmpp): enabled `send` trigger and made it an asyncPoint

fix 375

setup.py

@@ -51,8 +51,9 @@ install_requires = [
     'urwid >= 1.2.0, < 3',
     'urwid-satext == 0.9.*',
     'wokkel >= 18.0.0, < 19.0.0',
-    'omemo >= 0.11.0, < 0.13.0',
-    'omemo-backend-signal < 0.3',
+    'omemo >= 1.0.0, < 2',
+    'twomemo >= 1.0.0, < 2',
+    'oldmemo >= 1.0.0, < 2',
     'pyyaml < 7.0.0',
     'sqlalchemy >= 1.4',
     'alembic',