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/Application/Application.cs

@@ -0,0 +1,23 @@
+using System.Diagnostics;
+using System.Reflection;
+using System.Threading;
+
+namespace Server;
+
+public class Application
+{
+    public static void Main(string[] args)
+    {
+        bool profiling = false;
+
+        foreach (var a in args)
+        {
+            if (a.InsensitiveEquals("-profile"))
+            {
+                profiling = true;
+            }
+        }
+
+        Core.Setup(profiling, Assembly.GetEntryAssembly(), Process.GetCurrentProcess());
+    }
+}

Projects/Application/Application.csproj

@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <ApplicationIcon>MUO.ico</ApplicationIcon>
+        <StartupObject>Server.Application</StartupObject>
+        <AssemblyName>ModernUO</AssemblyName>
+        <Win32Resource />
+        <Product>ModernUO Server</Product>
+        <OutDir>..\..\Distribution</OutDir>
+        <Version>0.0.0</Version>
+        <Configurations>Debug;Release;Analyze</Configurations>
+        <RootNamespace>Server</RootNamespace>
+    </PropertyGroup>
+    <ItemGroup>
+      <ProjectReference Include="..\Server\Server.csproj" />
+      <ProjectReference Include="..\UOContent\UOContent.csproj" Private="false" PrivateAssets="All" IncludeAssets="None">
+          <IncludeInPackage>false</IncludeInPackage>
+      </ProjectReference>
+    </ItemGroup>
+</Project>