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When 'None' is selected for the configuration, an empty configuration is
created at build time and put into the bar.
Previously, we used a null argument for the conf Id when none was
selected. Now we use a dedicated none ID so it doesn't collude with the
logic that handle a real null id.

[STUDIO-3642](https://bonitasoft.atlassian.net/browse/STUDIO-3642)
Co-authored-by: adrien <adrien.lachambre@bonitasoft.com>

* do not throw a warning when at least one outgoing transition is took

Closes STUDIO-3655

Closes STUDIO-3659

Closes STUDIO-3609

Closes STUDIO-3609

* Layout manually the viewer composite after its creation to ensure that
all elements are visible (I believe that the early combo expand all /
bind selection leads to the ui issue)

[STUDIO-3627](https://bonitasoft.atlassian.net/browse/STUDIO-3627)

* The method 'refresh databinding' was called twice when switching to
Java object data type -> the 'handleValueChange' method was called a
second time, and the second time the else block was used -> a Data with
the wrong type was created.

[STUDIO-3609](https://bonitasoft.atlassian.net/browse/STUDIO-3609)

* use 2.0.3 connector implementation version

Closes STUDIO-3574

* When reordering elements in a list the sourcel list was not reorder

Closes STUDIO-3551