Mitigate Windows Anti Virus Flagging

[jacderida]

During community testnets, some Windows users have experienced the safe.exe and safenode.exe binaries being flagged by the integrated Windows Defender software. We should take steps mitigate this.

• Update the boilerplate testnet instructions to specify how to add exceptions to Windows Defender
• Obtain a code-signing certificate
• Extend the release process to sign Windows binaries with the code-signing certificate
• Submit binaries to Microsoft for whitelisting
• Investigate the use of VirusTotal in the CI process
• Consider submitting to other anti-virus vendors for whitelisting
• Provider users with guidance on submitting false positives to anti-virus vendors