Create module subsystem under TShockAPI.Modules

This should allow for TShock.cs to be split up to mini-modules, or "micro-plugins"

TShockAPI/Modules/Module.cs

@@ -0,0 +1,34 @@
+/*
+TShock, a server mod for Terraria
+Copyright (C) 2011-2019 Pryaxis & TShock Contributors
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+using System;
+namespace TShockAPI.Modules
+{
+	public abstract class Module : IDisposable
+	{
+		/// <summary>
+		/// Entry point of the module
+		/// </summary>
+		public abstract void Initialise();
+
+		/// <summary>
+		/// Resource cleanup, e.g. hooks and events
+		/// </summary>
+		public virtual void Dispose() { }
+	}
+}
+