lirc_imon: relocate input device emulation to packet handler, add scrolling and ffdc dev support
lirc_imon: relocate input device emulation to packet handler, add scrolling and ffdc dev support

- relocate the input device emulation code into the packet handler,
  to cut down on duplication when supporting both older and current
  iMON devices
- add scroll wheel emulation using ch+/- when in mouse mode
- support mouse functionality on the older ffdc devices

stb-tester/lirc,stb-tester/lirc,stb-tester/lirc,stb-tester/lirc,stb-tester/lirc,stb-tester/lirc