Upgrade revisions used for GitHub build

Windows Installer : Python3 + 64bit

Upgrade of windows installer build system:
- revisions.txt supports "local" to point to local working directories
- msys2 ucrt64 64b runtine
- use requirements.txt
- most python packages from msys2 repo
- still use pip/wine for other python packages
- some cleanup in Makfile code, removing dead code
- CANopen, Modbus and OPC-UA not included... to be continued.

Beremiz revision bump

Beremiz revision bump

revision bump

Windows installer: add winpaths.py to extend %PATH% so that build find msys2 binaries including Make.

keep pacman happy, even if it can't chroot to run scripts

update contact address in windows installer

cleanup dead/commented code

Fix computation of BVERSION leading to error message if beremiz source tree is missing when make is invoked

Add MSYS2' make to windows installer

Beremiz revision bump.

GH CD: beremiz revision bump.

HG CD: beremiz revision bump.

HG CD: beremiz revision bump.

Snap: better description

GH CD: beremiz revision bump

Beremiz revision bump.

Update documentation.

Windows installer: remove useless shortcuts.

Version "name" of installer and snap is now deduced from beremiz' version.py

Beremiz revision bump

GH CD: chechout all projects, even self from prep_sources.yml so that revisions.txt is not too old for Makefile.

revisions.txt is expected in $CWD When building Windows installer, in $CWD/sources for Snap. Deal with it for now.

GH CD: Seriously ? https://github.com/actions/upload-artifact#maintaining-file-permissions-and-case-sensitive-files

GH CD: seems that reusable workflow outputs can't make their way through.

GH CD: place revisions.txt so that snapcraft can find it.

re-starting xvfb-run too fast makes problems. Trying with -a

GH CD: fix artifact decompaction path

GH CD: try to see content of workdir.

Beremiz revision bump

GH CD: Merge sources and snap dir instead of just giving checkout and artfifact download the same path

Update README.md

GH CD: attempt to preserve content of build/source by swapping checkout and artifact download steps.

Fix generation of revisions.txt in makefile

SNAP: replace lxml versions to be compatible with Beremiz.

Forcing ubuntu20 python-lxml (4.5.0) package instead of PIP vesrion (4.9.1).
4.9.1 leads to derived variable types to appear as "derived" instead of real type name.
Problem happens with plcopen/variables_infos.ysl2 and plcopen/VariableInfoCollector.py.
No clue for now about what really breaks.

Beremiz revision bump

GH CD: Add Modbus and open62541 sources.

Add new sanity checksums.

SNAP: add Modbus source and dependencies

SNAP: add SVGHMI and OPC-UA dependencies

Add (untested) snapcraft workflow for GitHub action. Add documentation about manual snapcraft invokation.

Add Snap Package.

For now :
- using makefile :
$ cd ~/build; make -f ~/src/beremiz_public_dist/Makefile DIST=snap
- build and run of python exemple was tested
- no fieldbus support yet.

GH CI : add job 'needs' to ensure artifact is ready

GH CI : use artifacts to get data flowing from one workflow to the other

GH CI : adapt to workflow syntax restrictions

GH CI : fix workflow re-use path

GH CI : fix workflow re-use path

merge and update revision IDs

Update GH built windows installer's beremiz revision

Update GH built windows installer's beremiz revision

Update GH built windows installer's beremiz revision

Update GH built windows installer's beremiz revision

GH action : split workflows for later re-use of source provisioning.

That was a long sequence of '...' commit message. That last fix should make it build.

...