Changes

pySim-trace: pySim.apdu_source.stdin_hex

This introduces an "APDU source" for pySim-trace which enables the
decoding of APDUs that are copy+pasted from elsewhere, for example
APDU logs in text form created by proprietary tools, or to decode
personalization scripts or the like.

Change-Id: I5aacf13b7c27cea9efd42f01dacca61068c3aa33