cards: per-target TARs (ISD/UICC/USIM) and an ADM field in presets (v2.6.0)

- the SCP80 fieldset gains ISD TAR (000000), UICC TAR (B00000) and USIM TAR
  (B00001), prefilled with the spec defaults; empty stored values mean the
  default for that target (cardsTarValue)
- ADM field between "From card" and "Add", stored in the preset for later
  use by the file manager (placeholder ADM (optional), spaces stripped)
- packing a chain selects the preset TAR for its target: RAM/GP -> ISD,
  SIM RFM -> UICC, USIM RFM -> USIM (spec default without a preset);
  _spTarKey keeps the target when the card preset is picked afterwards,
  RAM card selection forces the ISD TAR
- USIM RFM 'from current DF' labelled (ADF.USIM); the list TAR column shows
  all three values; help EN/RU updated
- SW cache simple-v199; new cards_form.test.js + html markup guards
  (440 frontend / 281 Python tests green)

pysim_simple_server/server.py

@@ -24,7 +24,7 @@ from osmocom.construct import GsmOrUcs2Adapter
 from osmocom.tlv import BER_TLV_IE
 
 
-VERSION = '2.5.2'
+VERSION = '2.6.0'
 
 MAX_ENVELOPE_SEGMENTS = 5  # max SMS segments for outgoing C-APDU in ENVELOPE