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/Books/BookPacketTests.cs

@@ -5,24 +5,24 @@ using Server.Tests;
 using Server.Tests.Network;
 using Xunit;
 
-namespace UOContent.Tests
+namespace UOContent.Tests;
+
+public class TestBook : BaseBook
 {
-    public class TestBook : BaseBook
+    public TestBook(int itemID, int pageCount = 20, bool writable = true) : base(itemID, pageCount, writable)
     {
-        public TestBook(int itemID, int pageCount = 20, bool writable = true) : base(itemID, pageCount, writable)
-        {
         }
 
-        public TestBook(int itemID, string title, string author, int pageCount, bool writable) : base(itemID, title, author, pageCount, writable)
-        {
+    public TestBook(int itemID, string title, string author, int pageCount, bool writable) : base(itemID, title, author, pageCount, writable)
+    {
         }
 
-        public TestBook(int itemID, bool writable) : base(itemID, writable)
-        {
+    public TestBook(int itemID, bool writable) : base(itemID, writable)
+    {
         }
 
-        public TestBook(Serial serial) : base(serial)
-        {
+    public TestBook(Serial serial) : base(serial)
+    {
             Pages = new BookPageInfo[20];
 
             for (var i = 0; i < Pages.Length; ++i)
@@ -30,14 +30,14 @@ namespace UOContent.Tests
                 Pages[i] = new BookPageInfo();
             }
         }
-    }
+}
 
-    public class BookPacketTests : IClassFixture<ServerFixture>
+public class BookPacketTests : IClassFixture<ServerFixture>
+{
+    [Theory]
+    [InlineData("🅵🅰🅽🅲🆈 🆃🅴🆇🆃 Author", "🅵🅰🅽🅲🆈 🆃🅴🆇🆃 Title")]
+    public void TestBookCover(string author, string title)
     {
-        [Theory]
-        [InlineData("🅵🅰🅽🅲🆈 🆃🅴🆇🆃 Author", "🅵🅰🅽🅲🆈 🆃🅴🆇🆃 Title")]
-        public void TestBookCover(string author, string title)
-        {
             var m = new Mobile((Serial)0x1);
             m.DefaultMobileInit();
 
@@ -53,9 +53,9 @@ namespace UOContent.Tests
         AssertThat.Equal(result, expected);
         }
 
-        [Fact]
-        public void TestBookContent()
-        {
+    [Fact]
+    public void TestBookContent()
+    {
             var m = new Mobile((Serial)0x1);
             m.DefaultMobileInit();
 
@@ -89,5 +89,4 @@ namespace UOContent.Tests
         var result = ns.SendPipe.Reader.AvailableToRead();
         AssertThat.Equal(result, expected);
         }
-    }
-}
+}