struct mosquitto_msg_store -> struct mosquitto_base_msg
This is the base message which client messages and retained messages
refer to. The base messages are still held in the message store.
This change comes about because the persistence interface exposes these
message types. Prior to this commit the different messages were "msg",
"client_msg", and "retain". After this commit there is "base_msg",
"client_msg", and and "retain_msg" in the persist interface.
This allows a big swath of ifdefs to be removed. It also means savings as the db var is not passed around all of the time, and makes it easier to remove the final broker call to mosquitto_time() call in packet_mosq.c. In one test this reduced the calls to mosquitto_time() from 295k to 48k.
Roger A. Light