Memory leak fix in bellesip
Update Docker Debian 10 to add libjsoncpp-dev

MagicSearch reworking for async processing
Windows : Support MSYS2

Now we use a new version of the yocto image with python3 and python3
needed modules included. See meta-bc!3

Update cmake scripts to force python3.
Update docker images to install python3 and required python3 modules
when it was not already done.

Send email to pipeline triggerrer with graphical test report link, pipeline URL, commit hash and branch name

* re-enabled multithreaded makefiles jobs for centos7 and 8
* Changed Android tag from docker-android to docker (same runners)

Enable backtrace display in case of a coredump for windows using cdb (it is working, even if there are several bugs when win symbols need to be re-downloaded)

Added small script to check if there is orphan submodule commit referenced above (prevent clone errors on older git versions, and ensures to keep a clean git tree)

Feature/pipeline to update docker images (debian10, centos7, centos8, arch, ubuntu). "latestupdated" images MUST be re-tagged manually in order to be used by pipeline images.

Refactored Android upload to use build artifacts, uniformized way to declare archs between Android and iOS, added xamarin optional packaging and improved lisibility in files by comments blocks

Fixed sanitizer build and launch for Android and Linux, by forcing sanitizer flags in CMake cache, and by passing the -llog linker flags to the compiler (see related commit in cmake-builder)

changing the way to declare a scheduled job. Now the variable related to the scheduled job is needed in only. There is no excepts anymore. Renamed also the file related to linux prepare, and fixed the names reference in root files, and fixed typos

This reverts commit a1e1abb5.

attempt to turn tets jobs in parallel for bctoolbox, bellesip, bzrtp, belr, and bzrtp to compare results and time spent