modules/admin-full: don't bother with 4k vlan / no 4k vlan nuisances, simply enable it when available

modules/admin-full: fix wifi join when "wwan" (or other iface) already exists but only contains the network we intend to replace anyway, also save firewall settings after wifi join

	- move crontab to system menu
	- delete now empty services dispatcher
	- move service menu declaration into index

modules/admin-full: remove PVID support, its not really useful and confusing, fix parsing of port count and cpu port, expose hardware name

modules/admin-full: don't expose "reset" and "enable" options for switches, do not set any default state for "enable_vlan"