OutlineView

[jpogran]

VSCode 1.25 introduces a centralized OutlineView provider. To use this, we have to update the LanguageServer to support this provider (this ticket) as well as update the client to use the latest language server protocol version.

This happens to also help the VSCode 1.2X project as it will require updated dependencies.

The work for this ticket should be scoped to implement the following:

• Outlineview provider infrastructure implemented as feature toggle (Not applicable now)
• Show classes
• Show types
• Show parameters
• Show variables

There are more symbols to add than this, but this is a good scoped start

[jpogran]

@glennsarti Do we still want this as a feature toggle? I'm thinking no...

[glennsarti]

Given that;

• This has rescue around it
• The code itself isn't too complicated
• If the symbols don't work it's not the end of the world
• Has tests
• The LSP API for this is stable

I think we can safely deploy and release this feature without a toggle.