Feature request: use the Sparkle framework for app updates

[unikitty37]

A new version of DiffusionBee was just released. The current update process seems to be this:

• Click the button to open the page in the browser.
• Click the download button to download a DMG.
• Chop the end parts off the URL to get to the Releases page so I can see what's new.
• Find the DMG and double-click it to open it.
• Quit DiffusionBee.
• Drag the DiffusionBee icon to the Applications folder.
• Confirm I want to overwrite DiffusionBee.
• Eject the DMG.
• Drag the DMG to the Trash.
• Launch DiffusionBee.
• Confirm that I'm sure I want to open the app that was downloaded from the Internet.

With Sparkle, however, the process becomes this:

• A window opens containing the release notes.
• Click the Install Now button.
• Wait for the update to download and unpack.
• Click the Install Now button.
• DiffusionBee quits, updates itself, and relaunches. All temporary files are cleared.

It would be great if DiffusionBee could use Sparkle instead of the current manual process :)

[piotrski]

We could probably use https://github.com/electron/update-electron-app, but app will need to be packed into .zip

[Leland]

Also see #97

[officiallygeorge]

Bumping this with a +1. It's awesome how active this project is, but it's now time to implement Sparkle or another framework for making updates way less user-intensive.