Use chocolatey variables for simplicity and clarity

[dtgm]

https://github.com/chocolatey/choco/wiki/HelpersReference#variables

https://github.com/chocolatey/choco/blob/master/src/chocolatey/infrastructure.app/services/PowershellService.cs#L183-L205

Environment.SetEnvironmentVariable("chocolateyPackageName", package.Id);
Environment.SetEnvironmentVariable("packageName", package.Id);
Environment.SetEnvironmentVariable("chocolateyPackageVersion", package.Version.to_string());
Environment.SetEnvironmentVariable("packageVersion", package.Version.to_string());
Environment.SetEnvironmentVariable("chocolateyPackageFolder", packageDirectory);
Environment.SetEnvironmentVariable("packageFolder", packageDirectory);
Environment.SetEnvironmentVariable("installArguments", configuration.InstallArguments);
Environment.SetEnvironmentVariable("installerArguments", configuration.InstallArguments);
Environment.SetEnvironmentVariable("chocolateyInstallArguments", configuration.InstallArguments);
Environment.SetEnvironmentVariable("packageParameters", configuration.PackageParameters);
Environment.SetEnvironmentVariable("chocolateyPackageParameters", configuration.PackageParameters);
if (configuration.ForceX86) {
Environment.SetEnvironmentVariable("chocolateyForceX86", "true");
}
if (configuration.OverrideArguments) {
Environment.SetEnvironmentVariable("chocolateyInstallOverride", "true");
}
if (configuration.NotSilent) {
Environment.SetEnvironmentVariable("chocolateyInstallOverride", "true");
}

[tunisiano187]

Added on my list.
@gep13, i don't know if this is interesting to keep? i think it may be a risk if there are some changes of the variables...