Florian Müllner authored Apr 13, 2019 and Florian Müllner committed Apr 17, 2019

The port away from the old Shell.GenericContainer actor turned many JS
classes with a corresponding actor property into Clutter.Actor subclasses.
For compatibility reasons, those properties were kept around for a while.
They were now removed and any code that still uses them should be adjusted.

Facilitate that transition by defining the compatibility property on
Clutter.Actor itself, but log a warning every time it is accessed.

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