Massive sanity reorganization of project structure

Overall:
- Removed all 'TG' prefixes on classes and enums
Service:
- TGStationServer => ServerInstance
- TGServerService => Service
- Moved all ServerInstance partial classes to a subfolder
- Moved ChatProvider classes, delegate, and interface to a namespace
- Moved EventID and ChatMessageType to their own .cs files
- Moved SanitizeTopicString to Program
- ServerService.cs => Service.cs
- Fixed ProjectInstaller being in it's own namespace instead of
TGServerService
Interface:
- Moved ExitCode enum to Command class
- Moved all components to a namespace
- Moved all component enums to Enumerations.cs
- DDInteropCallHolder => DreamDaemonBridge
- Move PullRequestInfo and DreamDaemonBridge to their own .cs files
- Changes the type of ChannelFactory cache from Dictionary<Type,
ChannelFactory> to IDictionary<Type, ChannelFactory>

TGServerService/ServerInstance/PreactionHandler.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+
+namespace TGServerService
+{
+	// Some useful functions for triggering pre action events
+	partial class ServerInstance
+	{
+		const string EventFolder = "EventHandlers/";
+
+		string GetPath(string eventName)
+		{
+			return string.Format("{0}{1}.bat", EventFolder, eventName);
+		}
+
+		bool EventHandlerExists(string eventName)
+		{
+			return File.Exists(GetPath(eventName));
+		}
+
+		bool HandleEvent(string eventName)
+		{
+			if (!EventHandlerExists(eventName))
+			{
+				// We don't need a handler, so let's just fail silently.
+				return true;
+			}
+
+			var process = new Process
+			{
+				StartInfo = new ProcessStartInfo
+				{
+					FileName = GetPath(eventName),
+					UseShellExecute = false,
+					RedirectStandardOutput = true,
+					RedirectStandardError = true,
+					CreateNoWindow = true
+				}
+			};
+			process.Start();
+			process.WaitForExit();
+
+			var stdout = process.StandardOutput.ReadToEnd();
+			var stderr = process.StandardError.ReadToEnd();
+
+			Service.WriteInfo(
+				String.Format("Preaction Event: {0} @ {1} ran. Stdout:\n{2}\nStderr:\n{3}", eventName, GetPath(eventName), stdout, stderr),
+				process.ExitCode == 0 ? EventID.PreactionEvent : EventID.PreactionFail
+		   );
+
+			return process.ExitCode == 0 ? true : false;
+		}
+
+		public bool PrecompileHook()
+		{
+			return HandleEvent("precompile");
+		}
+
+		public bool PostcompileHook()
+		{
+			return HandleEvent("postcompile");
+		}
+	}
+}