Add in app updater

[WingofaGriffin]

It looks like you began code for this, but it seems to be a placeholder:

emu-hub/dev-app-update.yml

Line 2 in 9f1e045

url: https://example.com/auto-updates

Adding in an in app updater would be very convenient. Bonus for adding to package managers like the AUR and brew

[Droppisalt]

Also, a small change that could prove useful is a version number in the app itself. Could be in Settings Menu ⇾ About (you could have a link to the repo as well, etc.)