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>

TGServiceInterface/Components/Connectivity.cs

@@ -0,0 +1,17 @@
+using System.ServiceModel;
+
+namespace TGServiceInterface.Components
+{
+	/// <summary>
+	/// Used for testing connections to the service without authentication
+	/// </summary>
+	[ServiceContract]
+	public interface ITGConnectivity
+	{
+		/// <summary>
+		/// Does nothing on the server end, but if the call completes, you can be sure you are connected. WCF won't throw until you try until you actually use the API
+		/// </summary>
+		[OperationContract]
+		void VerifyConnection();
+	}
+}