This change allows us to pass any number of additional properties to embedPC(), which in turn can override properties contained in the XML file; the only property overrides currently supported are 'state' (which overrides any 'state' property set in the XML's <computer> element) and 'automount' (which overrides any 'automount' property set in the XML's <fdc> element). The goal is to make it easier to reuse XML machine definitions, by allowing commonly altered component attributes to be overridden.
HTML controls with bindings are now identified by the single class attribute of "{APPCLASS}-binding" instead of the somewhat arbitrary "{APPCLASS}-input" or "{APPCLASS}-output" classes
