Just making a track-able item for the changes we discussed in discord.

When the installer is invoked in silent mode (sunshine-installer.exe /S), the following should be suppressed:
https://github.com/LizardByte/Sunshine/blob/master/CMakeLists.txt#L561
https://github.com/LizardByte/Sunshine/blob/master/CMakeLists.txt#L567

specifically, launching the browser and asking the user about vigem.

Thanks!