[Feature] - Auto Update Tool

[ennerperez]

Provide an automate way to update the application using the notification system

• Update notifications models
• Include action in the notification toast
• Call the update tool
• Recover release information from GitHub
• Temporally download the release
• Close and replace the existing version
• Close and replace the update tool
• Cross Platform Implementation (WIP)

[love-linger]

In fact, older versions (before v6.2) of this software had a self-updating feature and it was removed for some reasons.

I would like to use a third-party library NetSparkle to supports self-update feature.

[love-linger]

@ennerperez If you want to implement this feature without introducing any other dependencies, I recommend not using App.SendNotification for notifications about updates. This is because messages sent by App.SendNotification will only appear on a certain page. Instead, I would like to open a new dialog window for update-available notification.

[love-linger]

After testing NetSparkleUpdater, I decided to implement a simpler one myself.

• It will NOT automatically updates self but will notify user while a new version is available. Then user can go to download page by a single click.
• Checking for updates automatically on startup can be turn off by user.
• User can skip a new version.
• User can manually check for updates from main menu.