Marked all service implementations as internal

Core - Enabled XML docs
Modules - Added DI to module VMs

src/Artemis.Core/Services/ModuleService.cs

@@ -10,7 +10,7 @@ using Serilog;
 
 namespace Artemis.Core.Services
 {
-    public class ModuleService : IModuleService
+    internal class ModuleService : IModuleService
     {
         private readonly ILogger _logger;
         private readonly IModuleRepository _moduleRepository;