fix(core): Adds Gump component functionality (#377)

- [X] Adds gump close packet
- [X] Fixes gump tooltip
- [X] Adds new compile/append functions for the new gump packets

Projects/Server.Tests/Tests/Collections/OrderedHashSetTests.cs

@@ -0,0 +1,24 @@
+using System.Linq;
+using Server.Collections;
+using Xunit;
+
+namespace Server.Tests
+{
+    public class OrderedHashSetTests
+    {
+        [Fact]
+        public void TestOrderedHashSet()
+        {
+            var set = new OrderedHashSet<string>(1) { "random string1", "another random string1", "another random string2", "another random string3" };
+            set.Remove("another random string1");
+            var list = set.ToList();
+
+            string[] arr = { "random string1", "another random string2", "another random string3" };
+            int i = 0;
+            foreach (var entry in list)
+            {
+                Assert.Equal(entry, arr[i++]);
+            }
+        }
+    }
+}