Command filter: FETCH and TERMINAL RESPONSE are separate entries (v2.7.1)

- the old "FETCH: ANY PROACTIVE" grouping label is gone: filter_label() now
  gives every command its own label, so the menu lists FETCH and TERMINAL
  RESPONSE individually — the multi-select filter (and the presets) cover the
  combinations that the grouping used to bundle
- the proactive presets keep their meaning: they name FETCH and TERMINAL
  PROFILE and reach the rest (a TERMINAL RESPONSE included) through the SW
  91xx rule; selecting FETCH now also brings its GET RESPONSE, which carries
  the fetched proactive command
- tests: the proactive-preset case follows the split (a TERMINAL RESPONSE is
  covered by 91xx, not by its name) plus a new case pinning the separate
  labels and the FETCH/GR pairing; 527 Python + 73 Node tests
- PWA_VERSION/pyproject/version.py 2.7.1, SW cache simtrace-analyser-v81

tests/test_pcap_import.py

@@ -224,7 +224,7 @@ class TestImportEndpoint(unittest.TestCase):
 class TestVersion(unittest.TestCase):
     def test_package_version(self):
         from simtrace2_pysniff import __version__
-        self.assertEqual(__version__, '2.7.0')
+        self.assertEqual(__version__, '2.7.1')
 
     def test_status_includes_version(self):
         import os