[GH-3] Add package source files

The source files were taken 1:1 from
https://chocolateypackages.s3.amazonaws.com/ChocolateyPackageUpdater.0.6.2.0.nupkg
[GH-4] Ketarin dependency now is ≥ 1.6.0.434
Ketarin.exe is in PATH, so no need to use hardcoded paths here
[GH-1] Use Get-BinRoot as installation directory

The previous binRoot mechanism was broken