Add a `ISO7816transmit` function close to the core implementation

[martinpaljak]

One functionality smart card developers need to implement on top of PC/SC style "BIBO" (Bytes-In, Bytes-Out) interface is often ISO 7816-4 based T=0 response handling for 6CXX (GET RESPONSE) and 61XX (fixed Le) handling. So instead of making another 20 line npm module for the usability improvement, it would be great if the functionality was traight in node-pcsclite, for those small scritps that build straight on top of node-pcsclite and do not want/need some heavier layer above it. Will make a PR if that sounds reasonable.

[santigimeno]

@martinpaljak yes, please :)