EliteMasks 1.6.8

## EliteMasks 1.6.8

### Added
- Mask effects now fire when a mask is put on a player's head by a dispenser, not
  just when they equip it by hand (1.13.1+).
- Equip events now carry the method used — shift-click, drag, hotbar swap, hand
  interact, dispenser, respawn, resurrect, or a durability break — so effects can
  tell how the mask went on.

### Fixed
- Masks are visible to other players again on modern servers. Version detection
  read the server version out of the Bukkit package name (`v1_20_R1`), which newer
  builds no longer include — so every version check fell through to the wrong
  packet layout and the equipment packet was silently malformed. The version is
  now taken from ProtocolLib's `MinecraftVersion`.
- Mask effects (Fly, Health, Hunger, Potion, Immunity, AntiPumpkin, Command) are
  reapplied when a player is revived by a Totem of Undying. A totem never fires
  PlayerDeathEvent, so the mask stayed on and the effect stayed "applied", but
  vanilla wiped every active potion effect on the way through — leaving the player
  wearing a mask that did nothing until they re-equipped it.
- Mask packets are no longer sent from an async task. Sending packets off the main
  thread was unsafe and could throw under load.
- Mask packets are now only sent to players in the same world as the wearer who can
  actually see them, instead of to every player on the server.
- The packet is skipped if the wearer logged out during the 2-tick delay.
- Item NBT is written through the current NBT-API path, fixing mask tags being
  dropped on newer server versions.

### Changed
- Added Minecraft 26.2 Support.
- `MaskPacket` rewritten: one version check at load instead of a chain of string
  comparisons per packet, and the three packet layouts (1.8, 1.9–1.15, 1.16+) are
  now selected by explicit version constants.
- Armor equip/unequip handling moved into PluginAPI. It used to be a separate
  bundled `armorequip` dependency, pinned at a different version in each plugin;
  all the Elite plugins now share one copy.

### Build
- ProtocolLib updated from 5.1.0 to 5.4.0.
- Underlying libraries updated with PluginAPI: Spigot API 1.20 -> 1.21.11,
  NBT-API 2.12.2 -> 2.15.7, XSeries 9.9.0 -> 13.7.0. Now targets Java 17.
- `EliteEnchantments` is now a Gradle project dependency instead of a prebuilt jar
  in `/jars`.
- Version is sourced from the root `versions.properties` and templated into
  `plugin.yml`.