Add image processing benchmarks and UI folder open buttons

- Added MaddoShared.Benchmarks project with BenchmarkDotNet for comprehensive image processing performance tests (parallel, chunk, size, stress).
- Included helper for generating test images and custom configs to ensure InProcess toolchain for .NET Windows compatibility.
- Added cross-platform scripts to run benchmarks easily.
- Updated .gitignore for benchmark artifacts and temp files.
- Exposed GetFilesToProcessPublic in ImageCreationStuff for testability.
- Added file name sanitization in ImageCreatorSharp to prevent IO errors.
- Enhanced WinForms UI: added "Open" buttons for source/destination folders, handled folder opening in Explorer, and improved user messaging and layout.
- Updated solution file to include new benchmark project.

MaddoShared.Benchmarks/BenchmarkConfig.cs

@@ -0,0 +1,91 @@
+using BenchmarkDotNet.Columns;
+using BenchmarkDotNet.Configs;
+using BenchmarkDotNet.Diagnosers;
+using BenchmarkDotNet.Engines;
+using BenchmarkDotNet.Exporters;
+using BenchmarkDotNet.Exporters.Csv;
+using BenchmarkDotNet.Jobs;
+using BenchmarkDotNet.Loggers;
+using BenchmarkDotNet.Toolchains.InProcess.Emit;
+
+namespace MaddoShared.Benchmarks;
+
+/// <summary>
+/// InProcess configuration for benchmarks requiring Windows-specific APIs
+/// This avoids the net10.0-windows vs net10.0 compatibility issue
+/// </summary>
+public class InProcessConfig : ManualConfig
+{
+    public InProcessConfig()
+    {
+        AddLogger(ConsoleLogger.Default);
+        AddExporter(HtmlExporter.Default);
+        AddExporter(MarkdownExporter.GitHub);
+        AddExporter(CsvExporter.Default);
+        AddDiagnoser(MemoryDiagnoser.Default);
+        
+        // Add job with InProcess toolchain
+        AddJob(Job.Default
+            .WithToolchain(InProcessEmitToolchain.Instance)
+            .WithWarmupCount(1)
+            .WithIterationCount(3));
+        
+        // Configuration options
+        WithOptions(ConfigOptions.DisableOptimizationsValidator);
+        WithOptions(ConfigOptions.KeepBenchmarkFiles);
+    }
+}
+
+/// <summary>
+/// Custom configuration for image processing benchmarks
+/// Uses InProcess toolchain to avoid net10.0-windows compatibility issues
+/// </summary>
+public class BenchmarkConfig : ManualConfig
+{
+    public BenchmarkConfig()
+    {
+        // Add console logger
+        AddLogger(ConsoleLogger.Default);
+
+        // Add exporters for different formats
+        AddExporter(HtmlExporter.Default);
+        AddExporter(MarkdownExporter.GitHub);
+        AddExporter(CsvExporter.Default);
+        AddExporter(RPlotExporter.Default);
+
+        // Add diagnosers
+        AddDiagnoser(MemoryDiagnoser.Default);
+        AddDiagnoser(ThreadingDiagnoser.Default);
+
+        // Add columns
+        AddColumn(StatisticColumn.Mean);
+        AddColumn(StatisticColumn.StdDev);
+        AddColumn(StatisticColumn.Error);
+        AddColumn(StatisticColumn.Min);
+        AddColumn(StatisticColumn.Max);
+        AddColumn(StatisticColumn.Median);
+        AddColumn(BaselineRatioColumn.RatioMean);
+
+        // Customize jobs with InProcess toolchain for Windows compatibility
+        AddJob(Job.Default
+            .WithToolchain(InProcessEmitToolchain.Instance)
+            .WithWarmupCount(1)
+            .WithIterationCount(3)
+            .WithId("Quick"));
+
+        AddJob(Job.Default
+            .WithToolchain(InProcessEmitToolchain.Instance)
+            .WithWarmupCount(2)
+            .WithIterationCount(5)
+            .WithId("Standard"));
+    }
+
+    /// <summary>
+    /// Fast configuration for development and quick tests
+    /// </summary>
+    public static IConfig Fast => new ManualConfig()
+        .AddLogger(ConsoleLogger.Default)
+        .AddExporter(MarkdownExporter.GitHub)
+        .AddDiagnoser(MemoryDiagnoser.Default)
+        .AddJob(Job.Dry.WithToolchain(InProcessEmitToolchain.Instance)); // Very fast, but less accurate
+}