The Sample Memory was changed to contain only the Instance Memory
Address instead of the whole Key Hash. This simplifies the B process and
reduces memory footprint.
The instance memory process was also updated to handle the conditional
fields defined in the previous commit.
Redefined Sample Memory Format. The design decision was made to handle
most (if not all) of the DDS QOS inside the History Cache, which allows
storing needed information in a more efiicient way.
A (dual port) Instance Memory was added into the HC, to support the QOS
operations.
This commit only implements the A side processes for the READER case.
RESOURCE_LIMITS_QOS, TIME_BASED_FILTER_QOS, and HISTORY_QOS are handled.
The inter-entity communication was changed to allow the HC to mark
parsed changes as rejected, and allow future re-transmission (in the
case of Reliable communication).
Initial imeplementation of the RTPS Reader side of the history cache.
A key_hash_generator entity that will house the future MD5 hash
calculation was also added, along with the entity definition of
key_generator, which has to be implemented per-topic-type.
