Added tests for LRUCache.

Moved core test code to reflect changes in core code.

Removed unused using directives.

tests/GameServiceWarden.Core.Tests/Modules/FakeService.cs

@@ -4,7 +4,7 @@ using System.IO;
 using System.Threading.Tasks;
 using GameServiceWarden.API.Module;
 
-namespace GameServiceWarden.Core.Tests.Modules.Games
+namespace GameServiceWarden.Core.Tests.Modules
 {
     public class FakeService : IService
     {

tests/GameServiceWarden.Core.Tests/Modules/FakeServiceConfigurable.cs

@@ -1,6 +1,6 @@
 using GameServiceWarden.API.Module;
 
-namespace GameServiceWarden.Core.Tests.Modules.Games
+namespace GameServiceWarden.Core.Tests.Modules
 {
     public class FakeServiceConfigurable : IServiceConfigurable
     {

tests/GameServiceWarden.Core.Tests/Modules/FakeServiceManagerMonitor.cs

@@ -3,7 +3,7 @@ using System.Collections.Generic;
 using GameServiceWarden.API.Games;
 using GameServiceWarden.Core.Module;
 
-namespace GameServiceWarden.Core.Tests.Modules.Games
+namespace GameServiceWarden.Core.Tests.Modules
 {
     public class FakeServiceManagerMonitor : IServiceManagerMonitor
     {

tests/GameServiceWarden.Core.Tests/Modules/FakeServiceModule.cs

@@ -1,7 +1,7 @@
 using System.Collections.Generic;
 using GameServiceWarden.API.Module;
 
-namespace GameServiceWarden.Core.Tests.Modules.Games
+namespace GameServiceWarden.Core.Tests.Modules
 {
     public class FakeServiceModule : IServiceModule
     {

tests/GameServiceWarden.Core.Tests/Modules/ServiceDescriptorTest.cs

@@ -7,7 +7,7 @@ using Xunit;
 using Xunit.Abstractions;
 using System.Text;
 
-namespace GameServiceWarden.Core.Tests.Modules.Games
+namespace GameServiceWarden.Core.Tests.Modules
 {
     // Testing convention from: https://docs.microsoft.com/en-us/dotnet/core/testing/unit-testing-best-practices
     // fakes are generic test objects, 

tests/GameServiceWarden.Core.Tests/Modules/ServiceManagerTest.cs

@@ -12,7 +12,7 @@ using Xunit.Abstractions;
 using System.Text;
 
 [assembly: CollectionBehavior(DisableTestParallelization = true)]
-namespace GameServiceWarden.Core.Tests.Modules.Games
+namespace GameServiceWarden.Core.Tests.Modules
 {
     [CollectionDefinition("Service")]
     public class ServiceManagerTest