Fix debugger startup hang when session still initializing #431
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This change fixes a hang that occurs when the user starts the debugger
right when the PowerShell session is still initializing. This is caused
by a call to PowerShellContext.SetWorkingDirectory which isn't
respecting the current state of the runspace. The fix is to ask for a
RunspaceHandle to ensure that the runspace is free before attempting to
set the working directory.
Resolves PowerShell/vscode-powershell#632