Changes

Paper-only event `skeleton horse trap` and `EntityTrapped` properties for `SkeletonHorse`s (#2446)

* `EntityTrapped` property for SkeletonHorses

* Paper only event `skeleton horse trap`

Also use updated `instanceof` syntax for `EntityTrapped`

* Update NMS Version

Property does not work in 1.17.1

* Move `trap_time` to its own property: `EntityTrapTime`

* Update `getPropertyString()` and remove redundant checks

Also cast the trap time to a long, because `getTrapTime()` returns the time in ticks, not seconds, so the times would be WAAAYYY off haha.
 (commit: 5ea2989)