Add raw HF signal plotting (#786)

* Add raw HF signal plotting
* new fpga module hi_get_trace.v - store A/D converter output to circular buffer on FPGA
* new command 'hf plot' - pull data from FPGA and display it in Graph Window

armsrc/iclass.c

@@ -51,6 +51,7 @@
 #include "protocols.h"
 #include "optimized_cipher.h"
 #include "usb_cdc.h" // for usb_poll_validate_length
+#include "fpgaloader.h"
 
 static int timeout = 4096;