SVGHMI: add support for "enable expressions" with arbitrary variable name assignment.

HMI tree paths can be prefixed with a variable name "@name=/MY/HMI/VAR"
Widget declarations can end with a "#" followed by a JS expression that refers to name given to variables.
Widget is disabled if expression's result is false.

Commit includes some more-or-less related generated code refactoring, that should simplify extending widget's variables attributes.

SVGHMI: preliminary implementation of a general enable bit for all widgets, using "#" at the end of widget declaration, and a "disabled" element that becomes visible instead of widget when disabled.

SVGHMI: rename veriables in parse_labels.ysl2 for better readability

OPC-US client: add support for x509 and user+password authentication.

Commit for backup not including tests since encrypted OPC-UA test are still not valid.

IDE: fix wxPython 3->4 API change leading to exception in type selection menu in CodeFileEditor

OPC-UA, IDE: add CTN parameters to support OPC-UA encryption and authentication.

xmlclass had to be enhanced to support elements with no content in xsd:choice

IDE: Fix tooltip not being shown anymore on any toolbars since switch to wxPython4.

Cleanup and update version.py

IDE: Fixed About dialog exception on Windows, and typo in about dialog's content.

runtime: fix bugs introduced in previous commit, and refactor some code

Runtime: wx.app.mainLoop and twisted reactor now share main thread with runtime.Worker.

This fixes exception when invoking python interactive shell from Runtime's tray
icon right-click menu.

Probably a consequence of wxPython upgrade, together with initial bad idea to
move wx.app.mainloop in non-main thread.

Remove useless assignment

SVGHMI: update generated XSLT

tests: fix load_and_build_tests.pytest

Leftover import from previously commented-out tests. Commented out as well.

Merge changes from default in wxPython4

SVGHMI: add support for multiline widget declaration using svg:desc.

Declaration started in inkscape:label and interupted by a '\' can be continued in the description field.
After an empty line, the rest of the description field is left for description text.

Runtime: Fix PLC python thread crash in case of exception in PostStart customization hook.

IDE+Runtime: fix exception when reconnecting with non-empty trace/force list.

Sometimes, remote call to SetTraceVariableList returned None just after reconnecting:
- changed caller to accept None (in case of connection problem)
- changer SetTraceVariable list to return 4 (DEBUG_SUSPENDED) if debug is suspended

Runtime: Retain: fix missuse of static classifier leading to ever increasing offset.

IDE: one more consequence of wxPython's 3 to 4 version bump

IDE+runtime: Fix .ico generation

IDE, SVGHMI: Workaround Snap package not launching Inskape, POEdit or Chromium directly, producing lot of output in Incskape CLI, and messing with TMPDIR

IDE: wxPython4 consequences : wx.OPEN -> wx.FD_OPEN

toolchain: GCC: use CFLAGS, LDFLAGS and SYSROOT given in environment

IDE: fix About dialog not showing (wxPython4 sequel), update copyright section.

IDE: fix image generation from svg script that was deleting to many files on cleanup

IDE: images: regenerate png according to latest changes in SVG

IDE: images/icons.svg: Update logo, icon, build, clean, transfer, connect and disconnect.

LocalRuntime: Allow overriding local runtime python binary path using BEREMIZPYTHONPATH environment variable.

tests: debug_project IDE test: give up with unreliable OCR for "Force value" menu entry.

IDE: fix primary buffer selection being reset on each write to console on X11.

This problem was making debug_project IDE test randomly failing

test: IDE: Fix non repeatable select-all-delete in debug_project.

tests: Change OCR options to be more reliable on small fonts.

tests: add Beremiz project used in opcua_test CLI test

GitHub CI: my bad. m( Was just wrong version

GitHub CI: actions/checkout@v3 submodules=recursive fails.

Merge from default branch + fix traffic light example SVG missing background + update generated XSLT

SVGHMI: update generated xslt file

SVGHMI: Warn at build time when SVG refers to non-existing widget types.

SVGHMI: add support for user JS script added in inkscape's document properties / scripting / embedded scripts.

SVGHMI: update generated XSLT file

SVGHMI: re-organize animate() to ensure that page fade-out is always visible, also make fade-out curve more aggressive to enhance visual feedback.

tests: recommanded build options for open62541 leads to infinite linking time when building PLC

tests: one more stability related fix for debug_project IDE test

tests: fix tests being systematically re-executed

CLI: fix fake_wx for OPC-UA in CLI, match with test and requirements

CLI: Explicitely wait for user interrupt (-k) and flush stdout each line.

tests: IDE: fix again debug_project, making it hopefully more stable

wxPython4 sequels: fix Wx exceptions ignored because no traceback

Some exception triggered on wxPython side have None as traceback,
and exception hanlder was discarding them.

tests: IDE: prevent edit_project to save modifed example so that it doesn't influence following tests

tests: IDE: force reporting screenshot even after failing command

tests: CLI: add simple test running python example

tests: docker: add dependencies for CLI testing

tests: add support for CLI tests

tests: fix debug_project.sikuli again.
- tooltip and context menu overlap
- text not being replaced in forcing dialog

CLI: prevent LOCAL:// runtime to use GUI (tray icon) when launch from CLI.

Merge latest changes from default

wxPython4 sequels: fix exception in connection dialog, force black text in FBD.

- wxPython4 does not have RemoveSizer in API anymore.
- On GTK3 with dark theme default text colour is white, making it unreadable.

SVGHMI: fix js exception because of trying to find already detached elements by id.

SVGHMI: better handling of page switch fade-out.

- In cases or relative jump to current page, page was keeping black after switch.
- Now keep track of undergoing page switch without comparing subscribed page to visible page.