chore(content): Cleans up abilities and some spell timers (#427)

- [X] Exposes Index/Count on the timer.
- [X] Cleans up abilities
- [X] Combines some spell context/info objects with their timers to reduce allocations
- [X] Fixes a bug where immolating weapon both finishes effect or stops in the wrong order due to a race condition.

Projects/UOContent/Items/Weapons/Abilities/DualWield.cs

@@ -16,10 +16,8 @@ namespace Server.Items
         {
             if (GetSkill(from, SkillName.Ninjitsu) < 50.0)
             {
-                from.SendLocalizedMessage(
-                    1063352,
-                    "50"
-                ); // You need ~1_SKILL_REQUIREMENT~ Ninjitsu skill to perform that attack!
+                // You need ~1_SKILL_REQUIREMENT~ Ninjitsu skill to perform that attack!
+                from.SendLocalizedMessage(1063352, "50");
                 return false;
             }