Remove -A from almost all commands (#1897)

[g-linville]

for #1897

-A is now only supported for acorn ps. Also, ps is the main name for that command now, instead of apps (which is still a valid alias).

Additionally, the behavior of -A will now only include other projects in the same Acorn "instance" (one installation of Runtime, or one instance of Manager).

Checklist

• The title of this PR would make a good line in Acorn's Release Note's Changelog
• The title of this PR ends with a link to the main issue being address in parentheses, like: This is a title (#1216). Here's an example
• All relevant issues are referenced in the PR description. NOTE: don't use GitHub keywords that auto-close issues
• Commits follow contributing guidance
• Automated tests added to cover the changes. If tests couldn't be added, an explanation is provided in the Verification and Testing section
• Changes to user-facing functionality, API, CLI, and upgrade impacts are clearly called out in PR description
• PR has at least two approvals before merging (or a reasonable exception, like it's just a docs change)

[iwilltry42]

Two questions, but nothing blocking.
LGTM