Added first visual-scripting draft [WIP]

src/Artemis.Core/VisualScripting/INode.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+
+namespace Artemis.Core.VisualScripting
+{
+    public interface INode : INotifyPropertyChanged
+    {
+        string Name { get; }
+        string Description { get; }
+
+        public double X { get; set; }
+        public double Y { get; set; }
+
+        public IReadOnlyCollection<IPin> Pins { get; }
+        public IReadOnlyCollection<IPinCollection> PinCollections { get; }
+
+        public object CustomView { get; }
+        public object CustomViewModel { get; }
+
+        event EventHandler Resetting;
+
+        void Evaluate();
+        void Reset();
+    }
+}

src/Artemis.Core/VisualScripting/IPin.cs

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+using System;
+using Artemis.VisualScripting.Model;
+
+namespace Artemis.Core.VisualScripting
+{
+    public interface IPin
+    {
+        INode Node { get; }
+
+        string Name { get; }
+        PinDirection Direction { get; }
+        Type Type { get; }
+        object PinValue { get; }
+
+        bool IsEvaluated { get; set; }
+
+        void ConnectTo(IPin pin);
+        void DisconnectFrom(IPin pin);
+    }
+}

src/Artemis.Core/VisualScripting/IPinCollection.cs

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+using System;
+using System.Collections.Generic;
+using Artemis.VisualScripting.Model;
+
+namespace Artemis.Core.VisualScripting
+{
+    public interface IPinCollection : IEnumerable<IPin>
+    {
+        string Name { get; }
+        PinDirection Direction { get; }
+        Type Type { get; }
+
+        IPin AddPin();
+        bool Remove(IPin pin);
+    }
+}

src/Artemis.Core/VisualScripting/IScript.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+
+namespace Artemis.Core.VisualScripting
+{
+    public interface IScript : INotifyPropertyChanged, IDisposable
+    {
+        string Name { get; }
+        string Description { get; }
+
+        IEnumerable<INode> Nodes { get; }
+
+        Type ResultType { get; }
+
+        void Run();
+        void AddNode(INode node);
+        void RemoveNode(INode node);
+    }
+
+    public interface IScript<out T> : IScript
+    {
+        T Result { get; }
+    }
+}

src/Artemis.Core/VisualScripting/PinDirection.cs

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+namespace Artemis.VisualScripting.Model
+{
+    public enum PinDirection
+    {
+        Input,
+        Output
+    }
+}