Init commit

Infrastructure/MouseEventTriggers/DoubleClickEventTrigger.cs

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+using System.Windows.Input;
+
+namespace StructureHelper.Infrastructure
+{
+    public class DoubleClickEventTrigger : EventTriggerBase<MouseButtonEventArgs>
+    {
+        public DoubleClickEventTrigger() : base(args => args.ClickCount == 2) { }
+    }
+}

Infrastructure/MouseEventTriggers/MouseWheelDownEventTrigger.cs

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+using System.Windows.Input;
+
+namespace StructureHelper.Infrastructure
+{
+    public class MouseWheelDownEventTrigger : EventTriggerBase<MouseWheelEventArgs>
+    {
+        public MouseWheelDownEventTrigger() : base(args => args.Delta > 0) { }
+    }
+}

Infrastructure/MouseEventTriggers/MouseWheelUpEventTrigger.cs

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+using System.Windows.Input;
+
+namespace StructureHelper.Infrastructure
+{
+    public class MouseWheelUpEventTrigger : EventTriggerBase<MouseWheelEventArgs>
+    {
+        public MouseWheelUpEventTrigger() : base(args => args.Delta < 0) { }
+    }
+}