Improved python wrapper documentation by adding None to nullable parameters and return values + documented callbacks property using Callable + make sure returned lists are empty arrays and never None

Add setting to disable RTP volumes, because implementaitons that do not ignore RTP extension headers they do not support.

Added same function as for media contents but for documents + fixed documentation for linphone_core_set_tone() method

Prevent crash on Android when a push notification is received after Core is created but before it is started

Do not do anything if a participant is added twice to a conference in a very short period of time - even before receiving the 200Ok response of the reINVITE

Fix soundcard sampling rate initialisation, fix non-usage of CallParams's Account property for sip routes.

+ audiostream rendering manages the local mix or transfer properties

Prevent 'Moving participant device ...' logs when Core starts, gaining a few hundred millisecs when Core starts + create vCard when adding address to Friend if need be

IOS - add setPushRegistryDispatchQueue function, which can be used before starting a core to receive VOIP push notification on a thread that is not the main thread. PushRegistry should run on the same queue as the core iterate()

This reverts commit 34b70a17.

Adjust "Alerts" suite to take into account that tmmbr values take into account non-controlled streams.

Added callback to notify newly discovered SIP addresses through long term presence (smart addressbook)

to:
- store conference information on the device holding the conference
- correctly set the organizer by looking at the joining mode. If it is
  FocusOwner, the use it
- Do not default organizer to me participant
- Set the role of the me participant of a local conference to speaker