Bugfix/confirmed handlers empty service request (#885)

* Added reject in all confirmed service handlers, except GetEventInformation, when confirmed services with zero length occur which rejects with required parameters are missing message.

* Refactored errno use in service using debug_perror. Changed debug_perror usage to debug_fprintf. 

* Updated file and function headers in basic/service modules.

* Changed NDPU priority on confirmed messages to use requested NDPU priority.

* Renamed debug_aprintf to debug_printf_stdout for clarity.

* Convert most debug_fprintf usage to debug_print to reduce text bloat in AVR build

apps/blinkt/blinkt.c

@@ -8,6 +8,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <signal.h>
+#include <errno.h>
 #include "blinkt.h"
 
 #define BLINKT_DEFAULT_BRIGHTNESS 7

apps/blinkt/main.c

@@ -99,8 +99,6 @@ static void Init_Service_Handlers(void)
         SERVICE_UNCONFIRMED_TIME_SYNCHRONIZATION, handler_timesync);
     apdu_set_confirmed_handler(
         SERVICE_CONFIRMED_SUBSCRIBE_COV, handler_cov_subscribe);
-    apdu_set_unconfirmed_handler(
-        SERVICE_UNCONFIRMED_COV_NOTIFICATION, handler_ucov_notification);
     apdu_set_unconfirmed_handler(
         SERVICE_UNCONFIRMED_WRITE_GROUP, handler_write_group);
     /* handle communication so we can shutup when asked */