fix(core): Converts some packets & misc fixes/cleanup (#414)

- [X] Adds a stop music packet
- [X] Converts chat packets
- [X] Breaks out chat code a little bit more
- [X] Converts character statue animation packet
- [X] Renames some folders to have spaces
- [X] Organizes and consolidates incoming/outgoing packets for other content
- [X] Fixes virtual checks

Projects/UOContent.Tests/Tests/Engines/Chat/ChatPacketTests.cs

@@ -0,0 +1,25 @@
+using System;
+using Server.Engines.Chat;
+using Server.Tests;
+using Server.Tests.Network;
+using Xunit;
+
+namespace UOContent.Tests
+{
+    public class ChatPacketTests
+    {
+        [Theory]
+        [InlineData(null, 100, "some param", "some other param")]
+        [InlineData("ENU", 200, "a third param", "another param")]
+        public void TestSendChatMessage(string lang, int number, string param1, string param2)
+        {
+            var expected = new ChatMessagePacket(lang, number, param1, param2).Compile();
+
+            using var ns = PacketTestUtilities.CreateTestNetState();
+            ns.SendChatMessage(lang, number, param1, param2);
+
+            var result = ns.SendPipe.Reader.TryRead();
+            AssertThat.Equal(result.Buffer[0].AsSpan(0), expected);
+        }
+    }
+}