fix: Fixes ignoring mobs, champions, party crash, slayer rarity, boat speedhack, etc (#1222)

* Movie ignore mobiles to Mobile class
* Allow necromancer familiars to ignore mobiles
* ChampionSpawn should not quietly fail when creating new spawn
* Fix client party crash bug: 2 people partied, the leader logs out, other client is hung
* Fix spellbooks creating with magery/meditation only and creating magery multiple times
* Fix BaseRunicTool.GetRandomSlayer() creating more undead slayers than intended
* Do not allow players to dismount each other whilst mounted
* Fix AOS onwards damage increase tooltip and wrong formula in AOS
* Fix monsters killing other monster revenants + animate dead should not attack player pets + other animates
* Fix fire steed having loot pack added twice
* Fix oaks spawn not able to create Unicorns + Kirins via Activator.CreateInstace() due to constructor having name as parametr
* Fix ignoreMobiles flag not propagated to client for non-players.
* Fix harrower tents not leeching from players
* Fix boats speedhacking around the map
* Fix bless, agility etc. not renewing duration
* Fix reveal always worked
* Fix empty constructor for steeds so they don't throw now.

Projects/UOContent/Spells/Base/SpellHelper.cs

@@ -312,7 +312,7 @@ namespace Server.Spells
                 return true;
             }
 
-            if (mod == null || mod.Offset < offset)
+            if (mod == null || mod.Offset <= offset)
             {
                 target.AddStatMod(new StatMod(type, name, offset, duration));
                 return true;