pysim/pcsc: do not use getProtocol for protocol selection
The documentation of the getProtocol provided by pyscard says:
"Return bit mask for the protocol of connection, or None if no protocol set. The return value is a bit mask of CardConnection.T0_protocol, CardConnection.T1_protocol, CardConnection.RAW_protocol, CardConnection.T15_protocol"
This suggests that the purpose of getProtocol is not to determine which protocols are supported. Its purpose is to determine which protocol is currently selected (either through auto selection or through the explicit selection made by the API user). This means we are using getProtocol wrong.
So far this was no problem, since the auto-selected protocol should be a supported protocol anyway. However, the automatic protocol selection may not always return a correct result (see bug report from THD-siegfried [1]).
Let's not trust the automatic protocol selection. Instead let's parse the ATR and make the decision based on the TD1/TD2 bytes).
