Rename --all to --workspace

[ehuss]

I have noticed that people occasionally get confused with the --all flag, usually confusing it with the --all-targets flag. I'd like to propose renaming it to --workspace which should better convey what the flag is for. We briefly discussed this in the team meeting and it seemed people were generally positive to the idea (and Josh came up with the best suggestion), so I'm opening this issue in case anyone watching this repo wants to provide feedback on the idea.

The --all flag would continue to work, but would be undocumented and deprecated and will probably issue a warning when used indicating the new flag name (maybe with a transition period with no warnings?).

[est31]

I like the shortness of --all. --workspace seems so long to type.

[est31]

What about adding a -wshorthand similar to how there is -p?

[k-nasa]

-w shortcuts are good.
how about @ehuss ?