merged main and jitter dev branch, self_test runs through but not yet BE

Squashed commit of the following:

commit 2f8090f5
Author: Stefan Bayer <stefan.bayer@iis.fraunhofer.de>
Date:   Mon Apr 24 07:15:05 2023 +0200

    cleanup

commit 9562e73a
Author: Stefan Bayer <stefan.bayer@iis.fraunhofer.de>
Date:   Fri Apr 21 06:31:29 2023 +0200

    added bit rate switching, also added missing bit rate switching modes for MASA and ISM to ivas_modes.json

commit 8f85e529
Author: Stefan Bayer <stefan.bayer@iis.fraunhofer.de>
Date:   Tue Apr 18 14:33:22 2023 +0200

    fix bug in udpating of the JBM TC buffers, wrong offset into copying old samples due to prematurely resetting n_samples_rendered

commit a0d60297
Author: Stefan Bayer <stefan.bayer@iis.fraunhofer.de>
Date:   Mon Apr 17 13:24:44 2023 +0200

    WSOLA TSM is now working with float in/out buffers (internally it was always float anyway), fixed a few rendering paths

commit ababf3f4
Author: Stefan Bayer <stefan.bayer@iis.fraunhofer.de>
Date:   Sun Apr 16 20:12:02 2023 +0200

    fixed several renderer paths

commit e51bd2e2
Author: Stefan Bayer <stefan.bayer@iis.fraunhofer.de>
Date:   Fri Apr 14 16:51:22 2023 +0200

    all possible render paths run now with variable speed decoding, audio quality only sparsely checked

commit 6b919859
Author: Stefan Bayer <stefan.bayer@iis.fraunhofer.de>
Date:   Tue Apr 11 09:36:06 2023 +0200

    some cleanup, removed duplication of transport channel buffering

commit 2c794eb6
Author: Stefan Bayer <stefan.bayer@iis.fraunhofer.de>
Date:   Thu Apr 6 09:45:51 2023 +0200

    JITTER (work in progress)