Code improvements / Fix warnings

- Fix CodeQL warnings
- Port lots of improvements/fixes from PR #225
- replace 'array_hexstr' and '%*H' format by sdk function 'format_hex'
- Add 'noreturn' attribute in 'main.c'

src_features/performPrivacyOperation/feature_performPrivacyOperation.h

@@ -1,3 +1,8 @@
+#ifndef _PERFORM_PRIVACY_OPERATION_H_
+#define _PERFORM_PRIVACY_OPERATION_H_
+
 #include "shared_context.h"
 
 uint32_t set_result_perform_privacy_operation(void);
+
+#endif  // _PERFORM_PRIVACY_OPERATION_H_