Changes

`/ex(s)`: remove redundant checks, minor cleanups

Checks such as checking the command name, permission, etc. are no longer needed, as this is handled by Bukkit internally.
Also few minor cleanups:
- Updated some code to `instanceof` pattern matching
- Cleaned up sending debug to the player; can just use `sender`'s `sendMessage` methods instead of casting it to a player
- Renamed `onTabComplete`'s `cmdName` param to `alias`, as that's what it actually is.
- Removed some old commented out code from `ExCommandHandler`.

Reported on [Discord](https://discord.com/channels/315163488085475337/1133477089606123640).
 (commit: 014df1d)

Patch time_lived for xp orbs (#2509)

 (commit: 5f3a593)

Add display entity properties to the preload list (#2511)

 (commit: 9d27245)

`EntityTag.visual_fire` property (#2510)

* `EntityTag.visual_fire` property

Property that returns whether an entity has a fake fire effect. Requested by zemenus on Discord.

* Fix issue with documentation.

<@link tag on_fire> -> <@link tag EntityTag.on_fire>
 (commit: ff0f280)

Update `switch_face` to `attachment_face` and add bells (#2512)

* Bell `attachment` mechanism beginnings

* It worked the whole time! I was using the wrong `adjust` command :P

Thanks for letting me know Aya.

* Add `attachment` logic to `switch_face`

Also updates `MaterialSwitchFace` to new Property system

* Update mech to `attachment_face` and more optimizations

* Update meta and add value for `DOUBLE_WALL`
 (commit: 7341333)

Fix metadata command not updating self (#2515)

* Fix metadata command not updating self

* Remove redundant check

* Use direct casting
 (commit: d3010de)

fix denizenclickable if chattrigger is set to async
 (commit: f362b88)

Update for nullable spawner types, `editMeta` util (#2514)

* Add `ItemProperty#editMeta` util

* Update & cleanup `ItemTag.spawner_type`

* Cleanup `ItemInstrument` and use `editMeta`

* Minor cleanup

* Support unsetting the instrument

* Minor cleanup

* `spawnerType` -> `spawnedType`

* Update `LocationTag` ones, make it 1.20+

* Correct no mech input check

* Use a direct cast

* Remove workaround for now fixed Spigot bug
 (commit: 890a0b6)

`EntityTag.is_sneaking` Paper-only property (#2508)

* Add `EntityTag.sneaking` property

* Meta improvements

* Deprecate `PlayerTag.is_sneaking`

* `ItemTag.trim` minor meta fix

* `PlayerTag.is_sneaking` deprecation fix

* Cleanup `MaterialAttachmentFace`

* Revert `PlayerTag.is_sneaking` deprecation

* Register existing tags when the prop isn't present

* Rename to `is_sneaking`

* Update another place

* Bump Paper API, add Citizens dependency

* Properly make NPCs sneak

* Remove trait when standing up
 (commit: 19433ee)

`BiomeTag.(water_)fog_color` tag + mech (#2516)

* `BiomeTag.(water_)fog_color` tag + mech

* Slight re-order
 (commit: 2ba64c9)

strip the display tag from items when setting lore to empty
 (commit: b62926e)

shapeless recipe counter: slightly more conservative check to avoid issues with duplicates

see https://discord.com/channels/315163488085475337/1128643225507344405/1128643225507344405 for explanation
 (commit: 07035dd)

fix Entity Killed context.entity calling the wrong method
 (commit: 2fac238)