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All extensions implement Extension; tags all implement ExtensionTag

Restructure ExtensionTag as an abstract class with default do-nothing
implementations of all methods.  So instead of Translate and LST
not implementing ExtensionTag::toDOM, they inherit the default
implementation which returns false, and that has the same effect.

The intention is to move SerialHandler::fromHTML and SerialHandler::before
into this framework as well.  Every "optional" method should have a default
implementation in the base class which returns false.

Change-Id: I0ad5c7146

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