v0.9.0

These improvements are described in detail in the vscode-powershell changelog
for its 0.9.0 release.

Language feature improvements

• Added PowerShell code formatting integration with PSScriptAnalyzer
• Improved PSScriptAnalyzer execution, now runs asynchronously
• Added Document symbol support for .psd1 files

Debugging improvements

• Remote session and debugging support via Enter-PSSession (PowerShell v4+)
• "Attach to process/runspace" debugging support via Enter-PSHostProcess and Debug-Runspace (PowerShell v5+)
• Initial psedit command support for loading files from remote sessions
• Added language server protocol request for gathering PowerShell host processes for debugging
• Many minor improvements to the debugging experience

$psEditor API improvements

• Added FileContext.Close() method to close an open file

Other fixes and improvements

• Fixed #339:
  Prompt functions that return something other than string cause the debugger to crash