software.go - handling missing InstallDate values

[djsvi]

Lots of application installers don't populate the InstallDate registry value. In these cases 'Add/Remove Programs' apparently substitutes the last modified date for that application's registry key. Better than nothing..

It looks like that could be pretty trivial to implement - https://pkg.go.dev/golang.org/x/sys/windows/registry#KeyInfo.ModTime - so hopefully you'll consider adding this?

Thanks.