The root cause is that `OutputBuffer` is not cleaned up (set to `null`) in `Stop` and `BeginStop/EndStop` when the powershell instance owns the `OutputBuffer` object. Since the pipeline has been intentionally stopped by the caller, the `OutputBuffer` should be set to `null` as well when it's owned by the PowerShell instance, just like how it's cleaned up in `EndInvoke`.
Based on standard practices, we need to have a copyright and license notice at the top of each source file. Removed existing copyrights and updated/added copyright notices for .h, .cpp, .cs, .ps1, and .psm1 files.
Updated module manifests for consistency to have Author = "PowerShell" and Company = "Microsoft Corporation". Removed multiple line breaks.
Separate PR coming to update contribution document for new source files: #6140
Manually reviewed each change.
Fix#6073
For PSCore 6, we are only supporting InitialSessionState. The RunspaceConfiguration APIs were already made internal. This PR removes all the code related to RunspaceConfiguration. This also means that some public APIs have changed. Was deciding between leaving the RunspaceConfiguration parameters and throwing Unsupported, but thought it was better to have it a compile-time error. This should simplify the code base.
1. The individual test files (.ps1) in `/test/powershell/engine` are moved to the corresponding subfolders.
2. The test asset file `test/powershell/Common/TestTypeFile.ps1xml` is moved to `test/powershell/Common/engine/Api/assets/` so that it's next to the test that is using the file.
Paul Higinbotham