Some initial CSharp scripting functionality

Barotrauma/BarotraumaShared/SharedSource/Net/ANetMod.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+
+namespace Barotrauma
+{
+    public abstract class ANetMod : IDisposable
+    {
+        private static List<ANetMod> mods = new List<ANetMod>();
+        public static List<ANetMod> LoadedMods
+        {
+            get => mods;
+        }
+        public ANetMod()
+        {
+            LoadedMods.Add(this);
+        }
+
+        public abstract void Dispose();
+
+        // TODO: some hooks
+    }
+}