feat: Add automatic update system with background checking

Implement a complete auto-updater system for Citron with the following features:

- Add UpdaterService class for handling update checks, downloads, and installations
- Add UpdaterDialog with progress tracking and user interaction
- Support both .zip and .7z archives with Windows PowerShell fallback
- Automatic background update checking on startup (3-second delay)
- Silent notifications when updates are available
- Manual "Check for Updates" menu option in Help menu
- User setting to enable/disable automatic update checks (enabled by default)
- Graceful error handling with detailed logging
- Restart functionality after successful updates
- Libarchive integration for cross-platform archive support

The system uses HTTP URLs to bypass SSL library compatibility issues and
provides a smooth user experience with minimal interruption during automatic
checks. Manual updates show a full dialog with progress tracking and changelog
information.

Fixes update distribution workflow and keeps users informed of new releases.

Signed-off-by: Zephyron <zephyron@citron-emu.org>

src/common/settings.h

@@ -617,6 +617,9 @@ struct Values {
                                        Category::WebService};
     Setting<std::string> citron_token{linkage, std::string(), "citron_token", Category::WebService};
 
+    // Updater
+    Setting<bool> enable_auto_update_check{linkage, true, "enable_auto_update_check", Category::WebService};
+
     // Add-Ons
     std::map<u64, std::vector<std::string>> disabled_addons;
 };