match: extract base class for matchers We will soon start splitting up the current matcher class into more specialized classes, so we'll want a base class for all the things that don't vary much between different matchers.

debugwalk: also print matcher representation This will make the effect of coming patches clearer.

wix: add 'ro' and 'ru' locales Also noticed when diffing an MSI installation against an Inno installation. OTOH, the Inno install doesn't include 'i18n' with the *.po files.