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Add the LinphoneImNotifPolicy object to configure whether to display/send IM notifications (is_composing, message delivered, message displayed).

The (is_)read field of a LinphoneChatMessage is now deprecated, the LinphoneChatMessageStateDisplayed state is used instead.

Store weak references of chat messages in the chat room to be able to returned the same LinphoneChatMessage object to the application.

# Conflicts:
#	daemon/commands/video.cc

to enable using local speaker in rtp_io mode. Option checked in [sound] section only.

This tries to replicate a reported issue where the HELLO packet was never repeated.
This commit also fixes the assert of SAS code equality, that was passed only if SAS are known.
A zrtp call without SAS would pass the test before.

This is causing undefined behaviors in belle-sip and SAL.