DHCP custom option (esp8266#8582)

* works

* fixup! works

* back to callbacks

* names

* daisy chain

* seconds

* less inline

* fix dns setter

* might as well keep using initlist

/to d-a-v it has automatic storage, here it's the same stack based one
(just one less line for us)

* shift blame

* naming

* fix impl

* revert to ip4 dns

* merge fix

* restyle

* masking done wrong

Author: mcspr

cores/esp8266/LwipDhcpServer-NonOS.cpp

@@ -71,19 +71,21 @@ extern "C"
     uint32 wifi_softap_get_dhcps_lease_time()
     {
         auto& server = getNonOSDhcpServer();
-        return server.get_dhcps_lease_time();
+        return server.getLeaseTime();
     }
 
     bool wifi_softap_set_dhcps_lease_time(uint32 minutes)
     {
         auto& server = getNonOSDhcpServer();
-        return server.set_dhcps_lease_time(minutes);
+        server.setLeaseTime(minutes);
+        return true;
     }
 
     bool wifi_softap_reset_dhcps_lease_time()
     {
         auto& server = getNonOSDhcpServer();
-        return server.reset_dhcps_lease_time();
+        server.resetLeaseTime();
+        return true;
     }
 
     bool wifi_softap_add_dhcps_lease(uint8* macaddr)