do not compile example plugin for iOS

liblinphone:
Correctly set minimum OS version for Apple devices to example plugin

Updated liblinphone & mediastreamer2 to fix an issue with OpenSLES on Android + prevent crash in PhoneStateListener

- Refactor account creator utility functions
- Migrate account creator random username and password generators from C to C++

Take into account bandwidth consumed by non-controlled streams (such as audio) for creating TMMBR requests for controlled streams. This should improve quality for medium bandwidth internet connections by avoiding a risk of congestion.

    Do not attempt to update contact address if the call session doesn't have an op associated to

[Belle SIP]
    Skip CRLF at the start of a NOTIFY body

    https://www.w3.org/Protocols/rfc1341/7_2_Multipart.html

    "The requirement that the encapsulation boundary begins with a CRLF
    implies that the body of a multipart entity must itself begin with a
    CRLF before the first encapsulation line -- that is, if the "preamble"
    area is not used, the entity headers must be followed by TWO CRLFs. This
    is indeed how such entities should be composed. A tolerant mail reading
    program, however, may interpret a body of type multipart that begins
    with an encapsulation line NOT initiated by a CRLF as also being an
    encapsulation boundary, but a compliant mail sending program must not
    generate such entities."

API for controlling remote push notifications parameter pn-call-remote-push-interval (Context iOS/Linhome)

Fix spurious re-INVTE after accepting a call that was disconnected during IncomingReceived state. Fix crash on iOS because of ToneManager busy with end tone of a past call while accepting a new incoming call.

Fix audio issue on iOS: audio route setting set prior to the beginning of a call was not taken into account.

Store content list under property 'content-list' to avoid having to split the multipart content body several times negatively affecting performances

          <entry uri="sip:username@domain">
           <display-name>displayName</display-name>
          </entry>

Modify video bandwidth estimator default settings to make it work with codecs that output small series of packets within frames (AV-1, H265)

Updated submodules to automatically change microphone device ID when switching output audio device (fixes echo on some devices such as Samsung when using AAudio)

Updated liblinphone to update @notnil tag on some callbacks prototypes + fix Android crash when display is null

Method uncompress_body_if_required removes that Content-Encoding message
header therefore liblinphone ha sno means of knowing whether the body
was compresses or not.
Now belle-sip adds a custom header "X-BelleSip-Removed-Content-Encoding"
to pass the encoding to liblinphone allowing to verify that both sender
and receiver have it set

Implement workaround for PBX servers that do not set the to header to the SIP identity of the callee, but to the contact uri.

Updated liblinphone to fix FileTransferContent not containaing downloaded file name in state changed callback

    participant(s) who couldn't receive the message correctly send an IMDN
    stating they received it (They switch to DeliveredToUser state)

 Upon reception of a chat message, set its state to Delivered as soon as the modifiers have been processed. This allow to insert the message in the database as being in the Delivered state and therefore initialize all recipients to Delivered

    Move local participant to DeliveredToUser as soon as the message and its attachments are downloaded
    Do not store the address of participants having received the message with their GRUU

Fix issue causing camera to be sent when accepting early media. Add asserts to avoid any future regression, and for audio as well.