Basic framework - server loader, plugin manager, chat interface

Piston/MyPlayerCollectionExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Sandbox.Game.Multiplayer;
+using Sandbox.Game.World;
+
+namespace Piston
+{
+    public static class MyPlayerCollectionExtensions
+    {
+        public static MyPlayer TryGetPlayerBySteamId(this MyPlayerCollection collection, ulong steamId)
+        {
+            var id = collection.GetAllPlayers().FirstOrDefault(x => x.SteamId == steamId);
+            return id == default(MyPlayer.PlayerId) ? null : collection.GetPlayerById(id);
+        }
+    }
+}