Fix some sonar findings

FluentTerminal.Models/KeyBinding.cs

@@ -1,4 +1,6 @@
-namespace FluentTerminal.Models
+using System;
+
+namespace FluentTerminal.Models
 {
     public class KeyBinding
     {
@@ -37,5 +39,10 @@
             }
             return false;
         }
+
+        public override int GetHashCode()
+        {
+            return HashCode.Combine(Command, Key, Ctrl, Alt, Shift, Meta);
+        }
     }
 }