Fix macOS crash and update submodule pointer

- Improve global exception handling in Program.cs and MainWindow.cs
- Update agg-sharp submodule pointer to the latest macos-fixes branch
- Ensure all necessary proyectos (Glfw, glfw-net) are included

Co-authored-by: roboter <386485+roboter@users.noreply.github.com>

Author: google-labs-jules[bot]