Use steamcmd itself instead of the API to check for updates

[pwfff]

I've been using this script since I can't get the API to work for recognizing Conan Exiles updates: https://bitbucket.org/shauder/conan-exiles-server-manager/src/193e1a22bd8dd2ae584a599858d9cd9c1eacb71e/RunConan.ps1?at=master&fileviewer=file-view-default#RunConan.ps1-1

It runs steamcmd with +app_info_update 1 +app_info_print 443030, no API key required. I think only one app ID is needed for this method as well.