WIP - Make the language server the default experience

[DonJayamanne]

When VS Code is opened, check for new versions in the background:

• Check only once a day/week
  • Frequency is user configurable (yes/no)
  • Frequency is Developer configurable (yes/no) (i.e. setting not defined in package.json)
• Add command to check for latest version
  • This would be visible to everyone
• Perform check in the background if we already have a language server (previously downloaded)
  • Benefit - User can continue using extension, while network operations are in progress (network comms, download, extract, etc).
• If a new version is available, then download it and extract it.
  • Finally notify the user about the new version, prompting them to restart.
  • Options in the message – [Restart VS Code] [Do not show this again]
  • This applies to the developer build of the extension
• If using release version of extension, pin the extension to a specific version of language server (x.y.z).
  • I.e. if we want to release a new version of the language server, we create a new release of the extensino
• If using dev version of extension, then pin the extension to the first two parts of the language server version.

@Microsoft/pvsc-team /cc

[DonJayamanne]

Re-opening as this is a perf issue.
@brettcannon Why was this closed?

[DonJayamanne]

Change links to http://pvsc.azureedge.net/python-language-server-beta/Python-Language-Server-osx-x64.0.1.44.nupkg

Note the CDN Host Name: http://pvsc.azureedge.net/