Add Serilog logging and refactor configuration handling

- Implemented Serilog in Program.cs for enhanced logging during application startup, including error handling.
- Updated Retroworks.RCBus.csproj to include Serilog and Serilog.Sinks.File package references.
- Modified Settings.cs to use a relative path for the configuration file, simplifying file handling.

Author: carlcnx

Retroworks.RCBus/Program.cs

@@ -1,5 +1,7 @@
 using System;
 using Avalonia;
+using Serilog;
+using System.IO;
 
 namespace Retroworks.RCBus
 {
@@ -9,10 +11,39 @@ internal sealed class Program
         // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
         // yet and stuff might break.
         [STAThread]
-        public static void Main(string[] args) => BuildAvaloniaApp()
-            .StartWithClassicDesktopLifetime(args);
+        public static void Main(string[] args)
+        {
+            // Set current directory to a writable location
+            string appData = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
+            var cwd = Path.Combine(appData, "Retroworks.RCBus");
+            Directory.CreateDirectory(cwd);
+            Directory.SetCurrentDirectory(cwd);
+            string logPath = Path.Combine(cwd, "Retroworks.RCBus-.log");
+
+            // Configure Serilog
+            Log.Logger = new LoggerConfiguration()
+                .MinimumLevel.Debug()
+                .WriteTo.File(logPath, rollingInterval: RollingInterval.Day)
+                .CreateLogger();
+            Log.Information("Program starting...");
+            Log.Information($"Working directory: {cwd}");
+
+            try
+            {
+                BuildAvaloniaApp()
+                    .StartWithClassicDesktopLifetime(args);
+            }
+            catch (Exception ex)
+            {
+                Log.Fatal(ex, "Application start-up failed");
+                throw;
+            }
+            finally
+            {
+                Log.CloseAndFlush();
+            }
+        }
 
-        // Avalonia configuration, don't remove; also used by visual designer.
         public static AppBuilder BuildAvaloniaApp()
             => AppBuilder.Configure<App>()
                 .UsePlatformDetect()

Retroworks.RCBus/Retroworks.RCBus.csproj

@@ -36,6 +36,8 @@
 		<PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.0" />
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.4" />
 		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+		<PackageReference Include="Serilog" Version="4.3.0" />
+		<PackageReference Include="Serilog.Sinks.File" Version="7.0.0" />
 		<PackageReference Include="SkiaSharp.NativeAssets.Linux" Version="3.116.1" />
 		<PackageReference Include="SkiaSharp.NativeAssets.WebAssembly" Version="3.116.1" />
 		<PackageReference Include="System.Configuration.ConfigurationManager" Version="9.0.4" />

Retroworks.RCBus/Services/Internals/Settings.cs

@@ -11,11 +11,7 @@ internal class Settings : ISettings
 
     public Settings()
     {
-        string appData = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
-        string configDir = Path.Combine(appData, "Retroworks.RCBus");
-        Directory.CreateDirectory(configDir);
-
-        string configPath = Path.Combine(configDir, "user.config");
+        string configPath = "user.config";
 
         // If config file doesn't exist, copy from default
         if (!File.Exists(configPath))