Investigate switching to vscode proper

[jonas]

A lot of features related with search are supported by vscode. We should investigate if it is possible to implement the platform specific parts of vscode to run completely in the browser.

• Workspace symbol provider #36 - Workspace symbol provider
• Search by filename #20 - Search by filename
• Add custom UI chrome and empty start page #29 - basic UI and start page
• Tabs
• File browser

A good starting point seems to be https://github.com/spiffcode/ghedit

[olafurpg]

It would be really nice to get tabs + file browser, so big 👍 from me. However, I don't know how complicated this would be to add to our build.

[olafurpg]

Is this a realistic goal? I believe it might be better to investigate how to create "Open file" actions that open the same search bar as the DocumentSymbolProvider.