SVGHMI: add "unsubscribable" property to widgets in order to generalize what already happens for jump buttons.
In most cases jump buttons do not really subscribe to pointed HMI variable, path is given as a relative page jump path. When widget.unsubscribable is set to true, no subscription is made on page switch, but still offset is updated.
This fixes bug happening on relative jump buttons without "disabled" element where offset did not change on relative page switch.
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<fileHeader companyName="Beremiz" productName="Beremiz" productVersion="1" creationDateTime="2012-09-12T23:30:19"/>
<contentHeader name="Wiimote example" modificationDateTime="2017-06-06T13:10:31">
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<content>
<xhtml:p><![CDATA[This example shows interaction of PLC program with Nintendo Wii Remote controller.
To work this example requires python-cwiid library to be installed.]]></xhtml:p>
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<xhtml:p><![CDATA[]]></xhtml:p>
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