External reader support over websocket

[skjolber]

Support for testing multiple cards on the same application.

• websocket Java server
• android client => Service with fine-grained controls
• programmatically trigger reader / card events from android unit test
• also works with emulator and other non-NFC devices

Recommended setup:

• One reader per card type
• ACR 1252 reader(s)
• private network (or local machine)