Decode sigrok-iso7816-stream RST/VCC line events (GSMTAP 0x10/0x11)

Support the sigrok-iso7816-stream decoder (FX2 logic-analyzer passive
SIM sniffer, github.com/anttro/sigrok_iso7816_stream) which streams
GSMTAP-SIM on UDP 4729 and adds two custom sub-types for line events.

- gsmtap.py: GSMTAP_SIM_RST_EVENT (0x10) / GSMTAP_SIM_VCC_EVENT (0x11).
- capture.py: gsmtap_msg_type() maps 0x10→'rst', 0x11→'vcc' (shared by
  the listener and tests); pcap.py _SUB_TYPE_NAMES gains the same
  entries so PCAP re-imports of these captures preserve the events.
- decode.py: decode_line_event() decodes [direction, level, reserved]
  into reset asserted/de-asserted or power applied/removed + level;
  routed through decode_sniff_msg.
- database.py: reset-assert and power-removal invalidate the per-channel
  file selection (card-level transition); de-assert / power-on are
  markers only.
- frontend: RST/VCC labels (RESET ASSERTED / VCC OFF, …), a detail-view
  branch (Event + Level + raw), and list styling (.apdu-type.rst/.vcc).

README notes the custom sub-type compatibility. Tests: +8 (line-event
vectors, sniff routing, subtype + PCAP round-trip mappings) — 359
total. Version 1.21.0, SW cache simtrace-analyser-v31.

simtrace2_pysniff/server/capture.py

@@ -3,7 +3,21 @@
 import time
 import threading
 
-from ..gsmtap import GsmtapReceiver, GSMTAP_SIM_ATR, GSMTAP_SIM_APDU
+from ..gsmtap import (GsmtapReceiver, GSMTAP_SIM_ATR,
+                      GSMTAP_SIM_RST_EVENT, GSMTAP_SIM_VCC_EVENT)
+
+
+def gsmtap_msg_type(sub_type):
+    """Map a GSMTAP-SIM sub_type to a stored message type.
+
+    Custom sigrok-iso7816-stream line events (0x10/0x11) become 'rst'/'vcc';
+    everything except ATR defaults to 'tpdu'.
+    """
+    return {
+        GSMTAP_SIM_ATR: 'atr',
+        GSMTAP_SIM_RST_EVENT: 'rst',
+        GSMTAP_SIM_VCC_EVENT: 'vcc',
+    }.get(sub_type, 'tpdu')
 
 
 class GsmtapListener:
@@ -23,8 +37,7 @@ class GsmtapListener:
             sub_type, data = self._receiver.read_packet()
             if sub_type is None:
                 continue
-            msg_type = 'atr' if sub_type == GSMTAP_SIM_ATR else 'tpdu'
-            yield msg_type, data, 0
+            yield gsmtap_msg_type(sub_type), data, 0
 
 
 class DirectSniffer: