API BREAK: pjsua_pres_create_uac() API CHANGED!! Added
options in the function, to allow creating SUBSCRIBE without
";id=" parameter in the Event header.
the generic event publication in pjsip-simple/publish.[hc]
split PIDF and X-PIDF body generation and parsing into
pjsip-simple/presence_body.c.
allow NULL in module parameter in pjsip_endpt_add_capability()
added "--publish" option in PJSUA.
by default, PJSUA-LIB will not add ";id=" parameter in Event
header in the SUBSCRIBE request since lots of server and
user agents don't support this correctly.