Anjay Lite 2.0.0

BREAKING CHANGES

• Removed support for TCP and TLS bindings in NET layer -
  ANJ_NET_WITH_TCP, ANJ_COAP_WITH_UDP, ANJ_COAP_WITH_TCP options were removed.
• Removed anj_net_shutdown from NET layer.
• Monotonic time is now the primary clock used for scheduling operations,
  replacing real-time clock usage across the codebase.

Features

• NTP module for time synchronization.
• (commercial version only) Added default OSCORE Object implementation.
• Added support for canceling observations with CoAP RST message.
• Re-introduced anj_core_ongoing_operation API.
• Added ANJ_OBSERVE_OBSERVATION_CANCEL_ON_TIMEOUT option to control behavior
  in case of notification timeouts.
• Introduced ANJ_LOG_MICRO option for optimizing footprint of
  logging with tools/micro_logs_decode.py tool to decode log messages.

Improvements

• Switch RNG implementation from getrandom() to getentropy() for improved portability.
• Tests structure refactored in order to increase coverage.
• Shorter Send operation payloads due to the use of a common path when encoding messages.
• MbedTLS integration layer sets the correct MTU value.
• MbedTLS is now fetched and compiled only once when calling make all via root CMakeLists.txt.

Bugfixes

• Fixed a bug in TLV decoder that incorrectly rejected request with a resource
  instance specified in the uri-path.
• Fixed handling of Discover requests targeting the root path.
• Fixed incorrect descriptions of return values in callbacks from FOTA.
• Writes to Object Instances now ignore unknown optional Resources, per LwM2M specification.