Self-updater

[fenhl]

The desktop apps should be able to update themselves based on user preference. See the plando-random-settings riir branch for working code.

An open question is whether this can also be added to the BizHawk plugin.

[fenhl]

Implemented for the standalone macOS and Windows apps. Open tasks:

• [ ] Implement for the BizHawk plugin, making sure to sync to the supported BizHawk version since BizHawk updates generally break binary compatibility for external tools.
  • [x] “Check for updates” button in the main menu
  • [x] Follow config field to check for updates on launch
  • [x] Ask to set config field if missing
  • [ ] Allow changing config in main menu
• [ ] Allow changing the auto-update-check config in the standalone app's main menu
• [ ] Further automate the macOS update process, perhaps by using Sparkle. See also https://twitter.com/kornelski/status/1396803471698010114 and https://twitter.com/kornelski/status/1396803619681353728.