fix: delete multiple plugins at once

[vladdoster]

Description

• delete subcommand can now take multiple arguments
• improved logic for --all, --clean flags
• improved log output
• now cleans up broken symlinks

zinit delete <Plugin> <Plugin> ...

Closes https://github.com/zdharma-continuum/zinit/issues/57 Closes https://github.com/zdharma-continuum/zinit/issues/239

Motivation and Context

Usability

Related Issue(s)

Closes #239 Closes #57

Usage examples

zi delete --help

How Has This Been Tested?

Left side is proposed changes and right side is current Zinit.

delete output improved

clean doesn't run if no unloaded plugins

improved logic

Types of changes

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [X] My change requires a change to the documentation.
• [X] I have updated the documentation accordingly.
• [X] I have added tests to cover my changes.
• [X] All new and existing tests passed.

[vladdoster]

@pschmitt,

I apologize for my annoying PR behavior during the last few PRs. I remembered a linked branch for the issue and moved my changes to the branch.

Furthermore, I'll be more diligent with my PRs to avoid it happening again :^) .

[vladdoster]

I'll fix the documentation in a separate PR. See PR in zshelldocs.

Good catch on the " to ' fix.

[pschmitt]

Aight, let's gooooo!