Data model visualization - Moved services and VMs to UI.Shared

Data model visualization - Added support for custom display VMs
Data model visualization - Added framework for custom input VMs
Shared UI - Made internal converters public

src/Artemis.UI.Shared/DataModelVisualization/DataModelInputViewModel.cs

@@ -0,0 +1,28 @@
+using Artemis.Core.Plugins.Abstract.DataModels.Attributes;
+using Stylet;
+
+namespace Artemis.UI.Shared.DataModelVisualization
+{
+    public abstract class DataModelInputViewModel<T> : DataModelInputViewModel
+    {
+        protected DataModelInputViewModel(DataModelPropertyAttribute description)
+        {
+            Description = description;
+        }
+
+        public DataModelPropertyAttribute Description { get; }
+        internal override object InternalGuard { get; } = null;
+    }
+
+    /// <summary>
+    ///     For internal use only, implement <see cref="DataModelInputViewModel{T}" /> instead.
+    /// </summary>
+    public abstract class DataModelInputViewModel : PropertyChangedBase
+    {
+        /// <summary>
+        ///     Prevents this type being implemented directly, implement <see cref="DataModelInputViewModel{T}" /> instead.
+        /// </summary>
+        // ReSharper disable once UnusedMember.Global
+        internal abstract object InternalGuard { get; }
+    }
+}