Add crash handler stuff.

Penumbra.CrashHandler/Program.cs

@@ -0,0 +1,30 @@
+using System.Diagnostics;
+using System.Text.Json;
+
+namespace Penumbra.CrashHandler;
+
+public class CrashHandler
+{
+    public static void Main(string[] args)
+    {
+        if (args.Length < 2 || !int.TryParse(args[1], out var pid))
+            return;
+
+        try
+        {
+            using var reader = new GameEventLogReader();
+            var       parent = Process.GetProcessById(pid);
+
+            parent.WaitForExit();
+            var       exitCode = parent.ExitCode;
+            var       obj      = reader.Dump("Crash", pid, exitCode);
+            using var fs       = File.Open(args[0], FileMode.Create);
+            using var w        = new Utf8JsonWriter(fs, new JsonWriterOptions { Indented = true });
+            obj.WriteTo(w, new JsonSerializerOptions() { WriteIndented = true });
+        }
+        catch (Exception ex)
+        {
+            File.WriteAllText(args[0], $"{DateTime.UtcNow} {pid} {ex}");
+        }
+    }
+}