Avoid 3-staged warnings in installation flow on Windows, get around "Gate Keeper" on macOS

[kilrau]

Currently Windows Users are facing three different scary-looking warnings when downloading the XUD Explorer Binary with Chrome and running it for the first time:

1. Chrome throwing this on beginning of download: "This file is not commonly downloaded and may be dangerous." -> discard/Keep"
2. Chrome throwing this after download completed: "temporarily unsafe (hacked)" -> "Discard/Keep anyway"
3. Windows SmartScreen

#3 is easily fixed with an EV developer certificate.

#1 + #2 can be fixed by different means, but according to https://stackoverflow.com/questions/12231581/program-download-ie-chrome-is-not-commonly-downloaded-and-could-be-dangerou easiest by uploading the .exe to Google Drive - pretty evil by Google but it works and avoids any warning within Chrome.

[kilrau]

https://www.electronjs.org/docs/tutorial/code-signing

[kilrau]

So for Windows we'd need:
https://docs.microsoft.com/en-us/windows-hardware/drivers/dashboard/get-a-code-signing-certificate

And for Mac we need to have:
https://developer.apple.com/support/compare-memberships/
https://developer.apple.com/support/code-signing/

[kilrau]

Current status

Microsoft: https://sectigo.com/ssl-certificates-tls/code-signing is cheapest (349 USD/year)
Apple: created Apple Developer account, but program enrolment won't go through: