Extremely basic game ticker. (#126)

You can theoretically restart the round (resetting the map) now, but it breaks very badly if a client is connected due to various edge cases/race conditions.

Content.Server/GameTicking/GamePresets/PresetTraitor.cs

@@ -0,0 +1,12 @@
+using SS14.Shared.Log;
+
+namespace Content.Server.GameTicking.GamePresets
+{
+    public class PresetTraitor : GamePreset
+    {
+        public override void Start()
+        {
+            Logger.DebugS("ticker.preset", "Current preset is traitor.");
+        }
+    }
+}