make objectives use yml defined mind filters (#36030)

* add MindHasRole whitelist overload

* add mind filters framework

* add different mind filters and pools

* update traitor stuff to use mind filters

* line

* don't duplicate kill objectives

* g

* gs

---------

Co-authored-by: deltanedas <@deltanedas:kde.org>
Co-authored-by: ScarKy0 <106310278+ScarKy0@users.noreply.github.com>
Co-authored-by: ScarKy0 <scarky0@onet.eu>
Co-authored-by: SlamBamActionman <slambamactionman@gmail.com>

Content.Server/Mind/Filters/TargetObjectiveMindFilter.cs

@@ -0,0 +1,43 @@
+using Content.Server.Objectives.Components;
+using Content.Shared.Mind;
+using Content.Shared.Mind.Filters;
+using Content.Shared.Whitelist;
+
+namespace Content.Server.Mind.Filters;
+
+/// <summary>
+/// A mind filter that removes minds if you have an objective targeting them matching a blacklist.
+/// </summary>
+/// <remarks>
+/// Used to prevent assigning multiple kill objectives for the same person.
+/// </remarks>
+public sealed partial class TargetObjectiveMindFilter : MindFilter
+{
+    /// <summary>
+    /// A blacklist to check objectives against, for removing a mind.
+    /// If null then any objective targeting it will remove minds.
+    /// </summary>
+    [DataField]
+    public EntityWhitelist? Blacklist;
+
+    protected override bool ShouldRemove(Entity<MindComponent> mind, EntityUid? excluded, IEntityManager entMan, SharedMindSystem mindSys)
+    {
+        // ignore this filter if there is no user to check
+        if (!entMan.TryGetComponent<MindComponent>(excluded, out var excludedMind))
+            return false;
+
+        var whitelistSys = entMan.System<EntityWhitelistSystem>();
+        foreach (var objective in excludedMind.Objectives)
+        {
+            // if the player has an objective targeting this mind
+            if (entMan.TryGetComponent<TargetObjectiveComponent>(objective, out var kill) && kill.Target == mind.Owner)
+            {
+                // remove the mind if this objective is blacklisted
+                if (whitelistSys.IsBlacklistPassOrNull(Blacklist, objective))
+                    return true;
+            }
+        }
+
+        return false;
+    }
+}