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/uint_common.c

@@ -58,3 +58,20 @@ void reverseString(char *const str, uint32_t length) {
         str[j] = c;
     }
 }
+
+int bytes_to_string(char *out, size_t outl, const void *value, size_t len) {
+    if (outl <= 2) {
+        // Need at least '0x' and 1 digit
+        return -1;
+    }
+    if (strlcpy(out, "0x", outl) != 2) {
+        goto err;
+    }
+    if (format_hex(value, len, out + 2, outl - 2) < 0) {
+        goto err;
+    }
+    return 0;
+err:
+    *out = '\0';
+    return -1;
+}