Playground CLI improvements

[adamziel]

Let's review these, and other wp-now bug reports/feature requests, and use them to improve Playground CLI:

• WordPress/playground-tools#313
• WordPress/playground-tools#312
• WordPress/playground-tools#311
• WordPress/playground-tools#309
• WordPress/playground-tools#306
• WordPress/playground-tools#304
• WordPress/playground-tools#303
• WordPress/playground-tools#302

[orballo]

Is Playground CLI going to be an alternative to wp-now?

[adamziel]

@orballo that's the plan eventually, although I don't have any timeline to offer. With work like #1608, Playground will gradually absorb features like autodetection of directory contents.