Fixed issue when sending invitations through ConferenceScheduler when chat room params is set to use Flexisip backend

Reworked scheduled conferences creation & conference info sending API using new ConferenceScheduler object

Set organizer as admin and allow him to remove participants
The address of me when creating the conference from an op is the to of the op itself

- do not create any intermediate/dummy conference
- do not start a call to create a conference to allow creation while in a call

DanmeiChen authored 3 years ago and Andrea Gianarda committed 3 years ago

sal enable auto contact depend on param [net] « enable_nat_helper »
Allow participants to join the conference early
Implement auto accept of calls calling a focus URI

If set it is used to determine the "from" field at call creation

Update participant is in flag based on participant state and call participant device join and leave callback when adding and removing participants
Send participant device removed notify after removing device from list

- Remove used deprecated functions on video_definition and add missing linphone_core_set_preview_video_definition_by_name
- Add an API to get recommended video definitions to make a difference between what definitions Linphone support, and what definitions that are suitable for a widest set of hardware for all video codec implementations in order to excludes some very high definition formats that are unlikely to work unless specific hardware or codecs are used.

Directory API : allow to set data, config and download paths from factory. Keep fallback on old computation if paths are not set by the application.

A workaround before this fix is to set prefix before path.

- participant added to conference -> onParticipantAdded
- participant removed from conference -> onParticipantRemoved
- participant device added to conference -> onParticipantDeviceAdded
- participant device removed from conference -> onParticipantDeviceRemoved
- participant temporarely leavy conference -> onParticipantLeft
- participant rejoins conference -> onParticipantJoined

Verify behaviour when a participant removes video from a video conference

- allow remote to schedule a conference on a server
- start and end time are passed as the values of the active time attribute in the SDP invite
- an ICS is sent to all participants to be able to join the conference by dialling the focus address

	-bundle mode. 
	-aggregate IMDN.
	-LIME X3DH session corrupted
	-LIME X3DH stop/start core

François Grisez authored 3 years ago and Anthony Gauchy committed 3 years ago

(cherry picked from commit 29e8c3d5)

- create video stream to send and receive participant minatures
- add support for multiple video stream in SDP
- add label to stream to allow unique link between it and each participant in a conference

Correctly set stream direction in NOTIFY based on information gathered from SDP only
Deny subscription if conference event package is disabled
Clean up of main-db.cpp