* Use more efficient platform detection API
Use static and const new OperatingSystem class API to avoid string comparisons and extra allocations.
* Remove unused variable
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
Remove the code that spins up our own assembly load context. Keep the code that registers our `Resolve` method to the default loader's `Resolving` event, so that we can continue to do special assembly resolution as needed (such as the GAC probing logic needed for consuming FullCLR PS modules).
Essentially, the assembly `Microsoft.PowerShell.CoreCLR.AssemblyLoadContext.dll` is not needed anymore, the remaining code should be moved to S.M.A.dll. However, that will break DSC and other native hosts that are hosting powershell. So this assembly is kept for now.
The powershell project's `Main` function initializes the custom
`AssemblyLoadContext` and then delegates to `UnmanagedPSEntry.Start`.
This lets us undo several changes to the `ConsoleHost` managed
entry (notably, the `Start` function signature does not have to change,
thus the `consoleFilePath` variable still exists).
CarloToso