Traitor (#2566)

* basic implementation

* minor fixes

* objectives temp commit

* proper onstart bind

* changes all conditions to be bound to a mind-instance

* oops

* oops v2

* adds possiblity to enable duplicate assignment of objective
equal objectives are unable to be added

* minor fixes, adds greentext

* refactors incompatability to be defined by requirements

* fixes a wrong whitespace

* minor fix

* addressed reviews v1

* address reviews v2

Co-authored-by: Exp <theexp111@gmail.com>

* final sweep

* adds/refactors traitor&sss cvars

* Update Content.Server/Mobs/Mind.cs

* never trust github web

* adds datasets & makes codewords use them

* addresses exp's reviews

* addressed zumos reviews

Co-authored-by: Paul <ritter.paul1+git@googlemail.com>
Co-authored-by: Exp <theexp111@gmail.com>

Content.Server/Prototypes/DatasetPrototype.cs

@@ -0,0 +1,25 @@
+using System.Collections.Generic;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization;
+using YamlDotNet.RepresentationModel;
+
+namespace Content.Server.Prototypes
+{
+    [Prototype("dataset")]
+    public class DatasetPrototype : IPrototype, IIndexedPrototype
+    {
+        private string _id;
+        public string ID => _id;
+
+        private List<string> _values;
+        public IReadOnlyList<string> Values => _values;
+
+        public void LoadFrom(YamlMappingNode mapping)
+        {
+            var ser = YamlObjectSerializer.NewReader(mapping);
+
+            ser.DataField(ref _id, "id", "");
+            ser.DataField(ref _values, "values", new List<string>());
+        }
+    }
+}