Make built-ins extension pack

[marcdumais-work]

As a follow-up to #20, I was thinking that it would probably be easy to make an extension pack that would contain the subset of built-ins that are know to work well.

It would be useful as a shortcut to install the built-ins in one step

[akosyakov]

But for example apps we should not use pack but concrete extensions that extenders could pick, i.e. in Theia repo we just should update links don't exchange with a pack, not everybody wants to use everything.

[marcdumais-work]

@akosyakov I am ok with that - the example applications can be a showcase of individual extensions that one can pick, in a granular way.

Are you ok with the applications in theia-apps using an extension pack to pull all the working built-ins instead of individual links?

[akosyakov]

yes for theia-apps is fine

I wonder since we published to Open VSX Registry already, it would be good to make a PR in theia repo to update links

[marcdumais-work]

@vince-fugnitto Would you have time to update the built-ins used in the main repo's example applications, to use the public Open VSX registry instead of GH Releases?

e.g. a random one:
registry page: http://open-vsx.org/extension/vscode/vb
Download link: http://open-vsx.org/api/vscode/vb/file/vscode.vb-1.39.1.vsix

[marcdumais-work]

Closing in favor of: #40