Fixes:
* Change download URL to `https://www.linphone.org/technical-corner/linphone`
* Crash on contacts list when deleting a friend and trying to load logs.
* Message status behaviour : Resuming status when changing logs, cursor shapes updates, bind the `resend message` action to error icon
* Synchronize settings and main presence.
* QML Crashs on fullscreen
Features :
* Add utilities in fullscreen view (media quality, security, mutable speaker)
* Show fullscreen on the current call screen
* Show Display name of participant in conference
* Participants in conference are mutable
- Add interfaces to get full sip address
- Use Full Sip addresses when using getSipAddressObserver
- Return -1 instead of null when searching an index in an array in Javascript
- remove auth infos when removing proxy
- add a "Not Proxy" state for registration to know if the current proxy is a candidate to registration
- Adapt Account Model to ensure to use pointer when mixing javascript/C++
- When clicking on Accounts, force authentification request if the current proxy is not registered
* Core creation in main thread but still async with timers
* For conference : no filter on items model.
* Remove conference storage and use directly the one that is in Core
* Fix calls model updates when a call become empty
* Fix missing functions
* Set Max Participants to 20
