UniversalAdmin 1.4.0

Find second accounts of banned players - without storing addresses - and
the proxy checks for BungeeCord networks too.

Added

• Alt detection (opt-in, moderation.alts.enabled): every login stores
  a keyed hash of the address - never the address itself; IPv6 counts by its
  /64 network - and accounts that share one show up as possible alts:
  /admin alts <player>, the Possible Alts button on a profile, and a
  staff hint when a player joins who shares an address with a banned
  account (on every server of a network). Optionally refuse such players
  (moderation.alts.refuse-banned-alts, off by default;
  universaladmin.bypass.alt-check exempts players). Addresses are forgotten
  after moderation.alts.retention (90 days); /admin alts <player> forget
  deletes a player's on request; viewing and forgetting are audited. New
  permissions universaladmin.moderation.alts, .alts.forget and
  universaladmin.bypass.alt-check. See
  docs/user/modules/moderation.md
  and ADR 0020.
• UniversalAdmin BungeeCord: the proxy plugin for BungeeCord networks -
  bans, network maintenance, the network whitelist and the server-list text,
  the same config.yml as the Velocity plugin, /uabungee. On GitHub and as
  the -bungee version on Modrinth
  (ADR 0021).

Changed

• The proxy checks live in one place (proxy/common) for both proxy
  plugins; UniversalAdmin Velocity behaves as before.

Upgrading

• Replace the jars and restart; a new table is created automatically. Alt
  detection stays off until you switch it on. On a BungeeCord proxy, add
  universaladmin-bungee-<version>.jar and fill in its config.yml like the
  Velocity plugin's.

What's Changed

• UniversalAdmin 1.4.0 by @nicki41 in #6

Full Changelog: v1.3.0...v1.4.0