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Use coap_run_once() on for older versions of libcoap.

As version 4.2.1 of libcoap has the addr_info field in coap_session_t it
is being used here.

Although raw_identity is not used for libcoap prior version 4.3, it
must be defined as it is set in the PSK decode logic.

The dcaf_ticket_request_t structure now contains a flags parameter to
convey control options contained in requests. This field is currently
used only for ACE implementations.

* CBOR option numbers for ACE fields and error codes have been updated
  to draft-ietf-ace-oauth-authz-33 and draft-ietf-ace-oauth-params-13.
* Cleanup of unused definitions.
* New configuration parameter CONFIG_ACE_REQUEST_PROFILE. If set to
  a value != 0, the client will include an empty ace_profile parameter
  in the token request.

When LIBCOAP_VERSION < 4003000U is used, coap_new_client_session_psk()
must be called with a zero-terminated psk_identity. This change
ensures that identity is always terminated with a zero, and
raw_identity is never used.

* An empty ticket request is answered with an access ticket and
  instructions about the server to contact

A client may post an empty DCAF request to its CAM in order to
get instructions which server to contact along with a valid
access ticket.

dcaf_config.h includes pre-processor symbols that control the build
process for optional parameters and therefore must be included before
dcaf_int.h

* encapsulate CoAP processing loop for blocking requests in function
  dcaf_loop_io() for re-use in dcaf state engine (dcaf.c)
* allow transaction creation with empty PDU (allows state handling
  for cases where no initial unauthorized request has been performed)

The pre-processor options DCAF_CLIENT, DCAF_SERVER, and DCAF_AM are
set properly according to the respective CONFIG_ options.

The new options '--disable-client', '--disable-server', and
'--disable-am' can be used to exclude client-specific,
server-specific, or authorization-manager-specific code from the build
process. These options are specifically targeted on specialized builds
on constrained platforms to save memory.

The pre-processor symbol DCAF_CLIENT_VALIDITY_OPTION can be used to
the validity option supported by the DCAF client. Allowed values are
1, 2, and 3, respectively, the default is 1.

When the pre-processor symbol ESP_PLATFORM is defined, the default
pseudo random number generation function is set to esp_fill_random().

This change fixes a warning issued on platforms where size_t is
32 bit rather than 64 bit.

The pre-processor symbol CONFIG_DCAF_LOG_DEFAULT_LEVEL can be used to
set the default maximum log level.

Debug messages can be disabled entirely by setting CONFIG_DCAF_NODEBUG.

This reverts commit 871e673d.

This reverts commit 013e3f8c.

anybor is a light-weight CBOR encoder/decoder specifically developed
for the DCAF framework.

See https://github.com/catchorg/Catch2/releases/tag/v2.13.1

This change checks tinycbor.pc and sets cbor_CFLAGS and cbor_LIBS
accordingly. If tinycbor was found, HAVE_TINYCBOR is set to 1.
When tinycbor was not found, cn-cbor is tried as fallback. If
present, cbor_CFLAGS, cbor_LIBS, and HAVE_CNCBOR are set accordingly.

A DCAF_STRING of sufficient size is allocated for encoding or decoding the
psk_identity. When no processing is required or no string object was allocated
the psk_identity is parsed as raw data.

The function utf8_length() counts the total number of bytes required
to encode a given byte string.