feat: Splits Server in Core and Application (#1806)

> [!Note]
> **Developer Note**
> Now developers will only need to build/run the Application project instead of everything.
> When adding new projects, make sure to: 
> 1. Add a reference to that project in the Application project.
> 2. Add the dll file to the Distribution/Data/assemblies.json file

### Summary
- Adds an application project
- Consolidates process restarts to use `Core.Kill(true)`
- Removes some old messaging, for example processor optimization
- Fixes missing build cleanup

Projects/UOContent.Tests/Tests/Items/Misc/Corpses/CorpsePacketTests.cs

@@ -5,14 +5,14 @@ using Server.Tests;
 using Server.Tests.Network;
 using Xunit;
 
-namespace UOContent.Tests
+namespace UOContent.Tests;
+
+[Collection("Sequential Tests")]
+public class CorpsePacketTests : IClassFixture<ServerFixture>
 {
-    [Collection("Sequential Tests")]
-    public class CorpsePacketTests : IClassFixture<ServerFixture>
+    [Fact]
+    public void TestCorpseEquipPacket()
     {
-        [Fact]
-        public void TestCorpseEquipPacket()
-        {
             var m = new Mobile((Serial)0x1);
             m.DefaultMobileInit();
 
@@ -30,11 +30,11 @@ namespace UOContent.Tests
         AssertThat.Equal(result, expected);
         }
 
-        [Theory]
-        [InlineData(ProtocolChanges.None)]
-        [InlineData(ProtocolChanges.ContainerGridLines)]
-        public void TestCorpseContainerPacket(ProtocolChanges changes)
-        {
+    [Theory]
+    [InlineData(ProtocolChanges.None)]
+    [InlineData(ProtocolChanges.ContainerGridLines)]
+    public void TestCorpseContainerPacket(ProtocolChanges changes)
+    {
             var m = new Mobile((Serial)0x1);
             m.DefaultMobileInit();
 
@@ -53,5 +53,4 @@ namespace UOContent.Tests
         var result = ns.SendPipe.Reader.AvailableToRead();
         AssertThat.Equal(result, expected);
         }
-    }
-}
+}

Projects/UOContent.Tests/Tests/Items/Misc/Corpses/Packets.cs

@@ -1,12 +1,12 @@
 using System.IO;
 using Server.Items;
 
-namespace Server.Network
+namespace Server.Network;
+
+public sealed class CorpseEquip : Packet
 {
-    public sealed class CorpseEquip : Packet
+    public CorpseEquip(Mobile beholder, Corpse beheld) : base(0x89)
     {
-        public CorpseEquip(Mobile beholder, Corpse beheld) : base(0x89)
-        {
             var list = beheld.EquipItems;
 
             var count = list.Count;
@@ -49,13 +49,13 @@ namespace Server.Network
 
             Stream.Write((byte)Layer.Invalid);
         }
-    }
+}
 
-    public sealed class CorpseContent : Packet
+public sealed class CorpseContent : Packet
+{
+    public CorpseContent(Mobile beholder, Corpse beheld)
+        : base(0x3C)
     {
-        public CorpseContent(Mobile beholder, Corpse beheld)
-            : base(0x3C)
-        {
             var items = beheld.EquipItems;
             var count = items.Count;
 
@@ -127,13 +127,13 @@ namespace Server.Network
             Stream.Seek(pos, SeekOrigin.Begin);
             Stream.Write((ushort)written);
         }
-    }
+}
 
-    public sealed class CorpseContent6017 : Packet
+public sealed class CorpseContent6017 : Packet
+{
+    public CorpseContent6017(Mobile beholder, Corpse beheld)
+        : base(0x3C)
     {
-        public CorpseContent6017(Mobile beholder, Corpse beheld)
-            : base(0x3C)
-        {
             var items = beheld.EquipItems;
             var count = items.Count;
 
@@ -208,5 +208,4 @@ namespace Server.Network
             Stream.Seek(pos, SeekOrigin.Begin);
             Stream.Write((ushort)written);
         }
-    }
-}
+}