CHG: appmain now calls cmd_recieve as it should

CHG: flasher -  removed unneeded parameter to function
CHG: flasher - increased limit to fpga-files that can be loaded
FIX: main client,  wrong windows define fixed.
CHG: device side - recieve usb command does not always get 544 bytes.  usb packages can be incomplete.
CHG: usb_cdc.c also got piwi's changes.
CHG: uart_posix.c removed a debug value
CHG: uart_win32.c clean up.

client/proxmark3.c

@@ -125,7 +125,6 @@ static void *uart_receiver(void *targ) {
 				PrintAndLog("Sending bytes to proxmark failed");
 			}
 			 __atomic_clear(&txcmd_pending, __ATOMIC_SEQ_CST);
-			//txcmd_pending = false;
 			
 			// set offline flag
 			if ( counter_to_offline == 3 ) {
@@ -356,7 +355,7 @@ int main(int argc, char* argv[]) {
 
 #ifdef HAVE_GUI
 
-#  if _WIN32
+#  ifdef _WIN32
 	InitGraphics(argc, argv, script_cmds_file, usb_present);
 	MainGraphics();
 #  else