TwinColumn component does not have a "reorderable" attribute in XML

[GlebDurygin]

The TwinColumn has a setReorderable() method and has a TwinColumnLoader#loadReorderable() method in loader, but does not have a "reorderable" attribute in XML.
Also annotate the method using meta-annotations after adding the attribute to the XML:

    @StudioProperty(defaultValue = "true")
    void setReorderable(boolean reorderable);