#2132 let a player's energy vortex or blade spirits in pre-AOS Felucca target their own caster, gated by `FollowsAcquireRules`. #2232's AI overhaul moved the summon checks into `IsInvalidSummonTarget`, which excluded the caster in every era, and dropped the gate. Since then `FollowsAcquireRules` has had no readers and summons have never turned on their caster.
## Changes
- `IsInvalidSummonTarget` reads `FollowsAcquireRules` again. A summon that follows the acquire rules spares its caster and anyone the caster's harmful spells would spare. The vortex and blade spirits don't follow them in pre-AOS Felucca when a player summoned them.
- The animated-dead restrictions (no players, no other animated dead, no pets) apply to every animated summon regardless of that setting.
- `AcquireNewFocusMob` sets a berserk summon's caster aside and targets them only when nobody else is available. #2132 meant to prefer others, but its check only worked when the caster was scanned before the other candidates, and the vortex's Int-plus-Magery ranking usually puts a nearby caster first.
- The AOS summon-target check no longer dereferences a missing `SummonMaster`. A summon whose caster was deleted before a reload comes back without one.
Controlled summons are unaffected: since #2665 they target through `HandleControlled` and never reach this scan.
## Tests
`SummonAcquireRulesTests` has 6 cases, skipped without client map data. Pre-AOS Felucca: a vortex and blade spirits each target their caster when the caster is alone, and a vortex targets a bystander even when the caster ranks higher. Pre-AOS Trammel and AOS Felucca: the caster is still spared. An AOS scan next to a summon with no master doesn't throw. `UOContent.Tests`: 1148 passed, 2 skipped, 0 failed on Windows.
### Summary
Eliminates `IPooledEnumerable<T>` and `eable.Free()` from `Map` for mobiles. This drastically simplifies code that iterates in range, for example:
```cs
foreach (var m in m.GetMobilesInRange(5))
{
}
```
The code above no longer requires an eable and calling `Free()`.
- [X] Fixed several locations where an NPC that was damaged would cause a server crash.
- [X] Removed an unnecessary allocation in guard fake calls (NPCs calling guards on you)
- [X] Fixes damage precision loss in Poison Strike Spell
- [X] BogThing no longer attempts to "search" for boglings to eat when it is at full health
## Added Feature
Adds a single threaded array pool that works exactly the same as `ArrayPool<T>.Shared`.
The `STArrayPool<T>.Shared` can only be used on a single thread, the main game thread of the server.
Note: Unlike the built-in array pool, there is no hook into the _GC Gen 2_. This means to relieve potentially high memory pressure, `ArrayPool<T>.Shared.Trim()` must be called. The pool will only release arrays _after two successive calls within 10 seconds or longer_. If the server is at less than 70% total memory usage, or the server is not going to use this pool for something egregious, then don't bother ever calling Trim().
## Changes
- [X] Fixes ArrayPool calls that should be cleared due to references.
- [X] Benchmarks against ArrayPool with 4+ rented arrays deep of the same length.
- [x] Unit tests
- [X] Removes several `ToList()` uses with `PooledRefQueue`
- [X] Adds a `PeekRandom` to PooledRefQueue
- [X] Updates EV/BS so they dispel each other in a more efficient manner.
- [X] Fixes Firebomb so it works like a normal firefield.
- [X] Fixes field spells so they aren't unnecessarily using a Point3D ref more than necessary.
- [X] Removes extra allocation in campfire by using reverse loop.
- [X] Removes other LINQ calls that aren't needed.
* Adds the following configurations:
* `movement.delay.npcMinDelay` - 0.1 - Pets or Non-monster NPCs
* `movement.delay.npcMaxDelay` - 0.4 - Pets or Non-monster NPCs
* `movement.delay.monsterMinDelay` - 0.4 - Non-pet Monsters or NPC vs Player Combat
* `movement.delay.monsterMaxDelay` - 0.8 - Non-pet Monsters or NPC vs Player Combat
* `movement.delay.monsterMinDex` - 150 - Dex maximum for delay by dex
* `movement.delay.MinDex` - 190 - Dex maximum for delay by dex
