[WIP] Adding Sparkle for auto-update

[the0neyouseek]

Add auto-update system based on Sparkle.

This PR is WIP do not merge yet

Using the Sparkle Framework we can have an auto-update system as well as multiple features like incremental updates, periodical check for updated version and more.

Adding a "Check for updates…" item in the app menu will enable user to check manually for updates.

The goal of this PR is to be able to handle publishing a new release to GitHub using a script (publish_release.sh) that would generate all required files for the update (updates.xml, MonitorContorl.dmg, so on).

Here's a list of things left to do :

• Add Sparkle Framework
• Add "Check for updates…" button
• Script to generate and publish release [in progress]
  • Check if git tag already exist for release
  • Generate appcast item and add it to updates.xml
  • Create Github Release and upload dmg file
• Handle Changelog
• Setup Github Pages

[JoniVR]

I haven't used it before for Sparkle/macOS but wouldn't this be possible/easier using Fastlane?

[the0neyouseek]

Yeah it probably would, I hadn't tried fastlane before and didn't know about it. Since then I used it in one of my ios app at work and found it really cool. I'll close this PR and re-open it if I find the time to work on a fastlane version