copy working cardem app to trace

because the applications share the board capabilities defined in
libboard/*/include/board.h and USB configurations are enabled according
to the previously defined capabilities in libcommon/source.usb.c, all
applications actually offer the same functions.
thus creating the trace application is only mainly a cosmetic change, as the
sniffer function will also be present and enabled in the cardem application.

firmware/apps/trace/Makefile

@@ -0,0 +1,3 @@
+C_FILES += $(C_LIBUSB_RT)
+
+C_FILES += card_emu.c cciddriver.c iso7816_4.c iso7816_fidi.c mitm.c mode_cardemu.c mode_ccid.c simtrace_iso7816.c sniffer.c tc_etu.c usb.c