Framework: Rename client to app

[ehg]

Since code in client/ will be used for server side rendering, as well as client side rendering. Now that we're getting rid of the shared/ dir — the name of the client/ directory is misleading. We should rename it to app.

I think we'll need to:

• Rename client -> app
• Find and replace client references with app
• Update external repos that depend on the client dir, for example wp-desktop
• Update any external docs
• Check the semantics of the top-level directory structure. Does server make sense? How do we define app/?

@mtias have I missed anything?

[gziolo]

What about this crazy idea:

• Rename client -> src
• Move server -> src/server
• Keep extensions in src/extensions
• Add src/desktop?

It would help whenever we need to use glob to search for JS files 😛

[coderkevin]

Oh man, that would be one huge PR.

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[flootr]

I think this would still be nice to have. What do you think @ehg?