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bcf8f9ae75
This rather large commit implements most relevant dhcp options and rewrites dnsmasq's backend. By default dnsmasq is disabled, eventually we do want dnsmasq enabled for dhcp services by default, but dns itself disabled. For this reason we support port "0" as implemented at dnsmasq (not listening for dns). For cases where users want to integrate dns and dhcp services, the advise is to make dnsmasq listen on a non standard port and point unbound to the zones where dnsmasq is responsible for. This has the advantage of a direct connection between dhcp registered hosts and the requesting service. In these cases dnsmasq's dns service acts like a "connector". In the long run we should deprecate `regdhcpstatic` and `regdhcp` as these either belong to legacy isc-dhcp or hook kea entries (which are better served via unbound). The first mvc migration phase implemented IndexController.php, which we rename to SettingsController.php now as these results in more logical ui endpoints. Since we don't bind to addresses directly (unless specifically configured and adviced only for static setups), we can skip the newwanip event which means we don't restart the service on interface changes. dnsmasq is able to filter the relevant networks on the fly, which is the advised scenario and can cope more easily with changes. When different clients need to receive different options, we can use "tags" now. Requests can add tags to filter options which will be offered to the client, in the most simple scenario one would tag on a range or a host reservation, but more advanced choices can also be achieved using match statements (for example architecture [client-arch])