Move coap_session_t and coap_addr_hash_t to coap_session_internal.h.
Move internal session based function definitions to coap_session_internal.h.
Replace most references to "struct coap_session_t" with "coap_session_t".
Provide new functions to allow applications to access parts of coap_session_t
as appropriate and document these functions.
Update examples to use these new access functions where appropriate.
For the man documentation, move the client session setup functions to (new)
coap_endpoint_client(3) and update coap_session(3) with all the session access
functions as these are common to both the client and server.
[coap_endpoint_server(3) will be created when coap_context_t is obfuscated.]
Jon Shallow
0c3928f536