Add Mailing lists to Administration

A mailing list is an address that passes mail on to everyone on it. To
Stalwart it is its own object, x:MailingList, behind sysMailingList*, so
it gets its own section under Directory after Groups: search, fifty to a
page with each list's recipient count, and a panel to create, edit and
delete one.

Recipients are a property of the list, so unlike a group's members they
save with the rest of the panel. What Save sends for them is only what was
added and removed, one recipients/<address> pointer each -- the patch the
live server accepted -- so a recipient added elsewhere while the panel was
open is not taken out. They can be pasted several at a time, from a
spreadsheet column, a comma-separated line or Name <address>; anything with
an @ that is not an address stays in the box with a note. Past a dozen, a
filter narrows them.

That is all a list is in Stalwart -- no owners, moderation or posting
rules -- so that is all the panel offers.

The mock answers x:MailingList with two lists, the recipient set's live
shape, and the refusals a wrong address, a clash with an account and a
missing permission get.

Twenty-five new strings and one plural, in all nine catalogues.

web/src/lib/adminAccess.ts

@@ -27,7 +27,7 @@ export function can(perms: Permissions, object: AdminObject, op: AdminOp): boole
   return perms.has(`sys${object}${op}`);
 }
 
-export type AdminSection = "dashboard" | "accounts" | "groups" | "domains";
+export type AdminSection = "dashboard" | "accounts" | "groups" | "lists" | "domains";
 
 export type DashboardCard = "users" | "domains" | "pending" | "memory" | "received" | "sent";
 
@@ -62,6 +62,7 @@ export function adminSections(perms: Permissions): AdminSection[] {
   if (dashboardCards(perms).length) out.push("dashboard");
   // Groups are accounts to the server, behind the same two permissions.
   if (can(perms, "Account", "Query") && can(perms, "Account", "Get")) out.push("accounts", "groups");
+  if (can(perms, "MailingList", "Query") && can(perms, "MailingList", "Get")) out.push("lists");
   if (can(perms, "Domain", "Query") && can(perms, "Domain", "Get")) out.push("domains");
   return out;
 }