Nodes - Added node type registration system

Nodes - Moved models and node logic into core
Nodes - Added node service that leverages DI

src/Artemis.VisualScripting/Internal/ExitNode.cs

@@ -1,40 +0,0 @@
-using Artemis.Core.VisualScripting;
-using Artemis.VisualScripting.Model;
-
-namespace Artemis.VisualScripting.Internal
-{
-    internal interface IExitNode : INode
-    { }
-
-    internal class ExitNode<T> : Node, IExitNode
-    {
-        #region Properties & Fields
-
-        public InputPin<T> Input { get; }
-
-        public T Value { get; private set; }
-
-        #endregion
-
-        #region Constructors
-
-        public ExitNode(string name, string description = "")
-        {
-            this.Name = name;
-            this.Description = description;
-
-            Input = CreateInputPin<T>();
-        }
-
-        #endregion
-
-        #region Methods
-
-        public override void Evaluate()
-        {
-            Value = Input.Value;
-        }
-
-        #endregion
-    }
-}

src/Artemis.VisualScripting/Internal/IsConnectingPin.cs

@@ -1,5 +1,5 @@
 using System;
-using Artemis.VisualScripting.Model;
+using Artemis.Core;
 
 namespace Artemis.VisualScripting.Internal
 {