Re-implement chat in content. (#198)

* OOC is a word.

* Re-implement chat in content.

Content.Server/Interfaces/Chat/IChatManager.cs

@@ -0,0 +1,21 @@
+using SS14.Server.Interfaces.Player;
+using SS14.Shared.Interfaces.GameObjects;
+
+namespace Content.Server.Interfaces.Chat
+{
+    public interface IChatManager
+    {
+        void Initialize();
+
+        /// <summary>
+        ///     Dispatch a server announcement to every connected player.
+        /// </summary>
+        void DispatchServerAnnouncement(string message);
+
+        void DispatchServerMessage(IPlayerSession player, string message);
+
+        void EntitySay(IEntity source, string message);
+
+        void SendOOC(IPlayerSession player, string message);
+    }
+}