Core - Fixed data model namespaces

Modules - Added IsPropertyInUse API
UI - Properly dispose data model paths wherever they are used

src/Artemis.Core/Services/WebServer/EndPoints/DataModelJsonPluginEndPoint.cs

@@ -1,7 +1,6 @@
 using System;
 using System.IO;
 using System.Threading.Tasks;
-using Artemis.Core.DataModelExpansions;
 using Artemis.Core.Modules;
 using EmbedIO;
 using Newtonsoft.Json;

src/Artemis.Core/Services/WebServer/Interfaces/IWebServerService.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Threading.Tasks;
-using Artemis.Core.DataModelExpansions;
 using Artemis.Core.Modules;
 using EmbedIO;
 using EmbedIO.WebApi;

src/Artemis.Core/Services/WebServer/WebServerService.cs

@@ -4,7 +4,6 @@ using System.IO;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
-using Artemis.Core.DataModelExpansions;
 using Artemis.Core.Modules;
 using EmbedIO;
 using EmbedIO.WebApi;