[Windows] [IFW] Create shortcut in `shell:startup`

[LorenDB]

I'd like to give the user the option to install a shortcut in the shell:startup folder on Windows. However, I can't find any good way right off to determine the location of shell:startup in the installer. Does anyone have any suggestions as to how to proceed?

By the way, I am using CMake to configure my installer, so I may be missing a configuration option or two that CMake doesn't provide.