Anjay 3.12.0

BREAKING CHANGES

• PEP 668 was adopted. Using Python based tools requires a virtual environment
  and devconfig script ensures it's activated.
• Most tools from tests/integration/framework were extracted
  into tools/test-framework-tools directory which is being installed
  in venv by devconfig

Bugfixes

• Fixed crash in avs_coap when block transfers are disabled and outgoing
  message does not fit into the external output buffer.
• (commercial version only) Fixed a bug that made it impossible to set a Master
  Secret which length was anything other than 16 bytes (OSCORE).
• Fixed avs_coap tests for GCC 15

Features

• Added traffic interceptor usage to demo application.
• (commercial version only) Made it possible to set the maximum length of the
  Master Secret and Master Salt using the AVS_COAP_OSCORE_MASTER_SECRET_SIZE
  and AVS_COAP_OSCORE_MASTER_SALT_SIZE options, respectively.
• Removed experimental tags from server connection status API, IPSO objects v2
  API, Software Management object API, CoAP Download retry API and
  Confirmable Notification status callback API.

Improvements

• Reworked the help menu in Anjay Demo.
• (commercial version only) Added support for running PKCS11 integration tests
  with OpenSSL as (D)TLS backend.
• Migrated pymbedtls build system to pyproject.toml.