Initial work for AbstractUI options

OwlCore.Wpf/Converters/Time/Numerical/DoubleToTimeSpanConverter.cs

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+using System;
+using System.Diagnostics.Contracts;
+using System.Globalization;
+using System.Runtime.CompilerServices;
+using System.Windows.Data;
+
+namespace OwlCore.Wpf.Converters.Time.Numerical
+{
+    /// <summary>
+    /// A converter that converts a given <see cref="long"/> to a <see cref="TimeSpan"/>.
+    /// </summary>
+    public sealed class DoubleToTimeSpanConverter : IValueConverter
+    {
+        /// <summary>
+        /// Converts a <see cref="long"/> to a <see cref="TimeSpan"/>.
+        /// </summary>
+        /// <param name="value">The <see cref="TimeSpan"/> to convert.</param>
+        /// <returns>A formatted string of the <see cref="TimeSpan"/>.</returns>
+        [Pure]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static TimeSpan Convert(double value) => TimeSpan.FromMilliseconds(value);
+
+        /// <inheritdoc/>
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is double timeSpan)
+            {
+                return Convert(timeSpan);
+            }
+
+            return Convert(0);
+        }
+
+        /// <inheritdoc/>
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}