Conference list is filled after receiving conferenceChanged signals

instead of calling dbus_join_participant directly

Moved removeParticipant at the end of the function in order to give
time to rtpsessions to close

Store the id to send it to the deamon through DBUS

Signed-off-by: Alexandre Savard <alexandre.savard@savoirfairelinux.net>

instead of mymap[] uses mymap.insert()

mymap[] do not duplicate the key (which is what we want). However it
updates the mapped value (which is very very very bad).

Call someone, add incoming calls to the conference using the new conference button

Signed-off-by: Alexandre Savard <alexandre.savard@savoirfairelinux.net>