Node system - Added numeric struct and utilized it in nodes

src/Artemis.UI.Shared/Converters/StringToNumericConverter.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+using Artemis.Core;
+
+namespace Artemis.UI.Shared
+{
+    /// <summary>
+    ///     Converts <see cref="T:System.String" /> into <see cref="Numeric" />.
+    /// </summary>
+    [ValueConversion(typeof(string), typeof(Numeric))]
+    public class StringToNumericConverter : IValueConverter
+    {
+        /// <inheritdoc />
+        public object? Convert(object? value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return value?.ToString();
+        }
+
+        /// <inheritdoc />
+        public object ConvertBack(object? value, Type targetType, object parameter, CultureInfo culture)
+        {
+            Numeric.TryParse(value as string, out Numeric result);
+            return result;
+        }
+    }
+}