CSV export of the domain list

The "CSV" button above the domain list downloads the list with the current filters (client, state, system, search, sort): domain, client, state, CMS and version, registrar, domain expiry, certificate target, valid until, days left, open incidents, last check, paused and dashboard link. UTF-8 with BOM, semicolon for a German organization language, otherwise comma (selectable by parameter), dates as YYYY-MM-DD. Every role may export, client access only their own domains; 30 exports per hour and organization, also via API token.