- further implement RFC4575 media events
 - the conference sends out the conference capabilities in its full state notify
 - when the conference media change, a media event will be sent out to inform participants (onAvailableMediaChanged)
 - when a remote participant pauses its call and conference event package is enabled, a participant device media changed event is sent (onParticipantDeviceMediaChanged)
 - prevent that a core that supports the event conference package pauses individual calls in a conference
 - rework of address comparison using belle sip functions
 - add conference parameter to allow conference with one participant

Fix crash when receiving ICE password and ufrag in SDP media description rather than session description. Add tests.

Displays the URL of the test job in Allure report

Updated liblinphone with C# wrapper changes + don't bundle doc asset directory in Android AAR as it's breaking Xamarin build...

Fix "Conference with simple audio device change" after mixer takes into account cores that use files instead of sound cards

- Now uses the 'needs' keyword to require only the artifacts of the job we need, instead of waiting for each jobs of the previous stage to complete
- Uses 'changes keyword to allow submodules testers to run on mr on submodules changes
- Fixed belr tests in CI (wrong path to resource dir), fixed allure report URL for mediastreamer

Flagged by valgrind: Conditional jump or move depends on uninitialised value(s)

Add symbols for Windows (in6addr_any used by stun in MS2)
Fix cast errors for UWP
Fix VPX CPU architecture check for Windows
Add MBEDTLS_PUBLIC on mbedtls_vsnprintf to be used on Windows