CBOR type incompatibility

Hi there,

Cbor library seems to use `int` types and this library is using `int32_t`. 

```[c]
CBOR_INLINE_API CborError cbor_value_get_int(const CborValue *value, int *result)
```

E.g. `MQTTFileDownloader_cbor.c:135`

```[c]
cborResult = cbor_value_get_int( &value, ( int32_t * ) blockId );
```

As a result, we are getting tons of compilation errors.