[Windows] System-wide conda environments are not returned by EnumerateCondaEnvironments

[lostmsu]

We should have a clear separation of system-wide and user environments similar to EnvironmentVariableTarget.

By default, both types of environments should be returned, and CondaEnvironment should be able to tell the type to distinguish between them.

[lostmsu]

To reproduce simply run the app project, and use list command. System-wide environments will not be printed.

[kurikabocya]

Thank you, the [new] one worked!
[old]
GradientEngine.UseEnvironmentFromVariable();
[new]
System.IO.DirectoryInfo home = new System.IO.DirectoryInfo(@"c:\ProgramData\Anaconda3\envs\py35cpu");
PythonEnvironment myenv = CondaEnvironment.DetectCondaEnvironment(home);
GradientEngine.UseEnvironment(myenv);

[lostmsu]

@kurikabocya would you mind testing the fix for this issue? For that, either clone this repo and run app.csproj and pass single command line parameter list, or try your [old] code variant with the lasted nightly build of WhichPython ( you can install/update to preview package version from https://www.nuget.org/packages/WhichPython/0.3.4-CI-20201012-001 ).