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Fixes #9672
Co-authored-by: Marc Cornellà <hello@mcornella.com>

* Don't error on upgrade no-op

No error code is required for a non failure scenario.

* Manually check whether changes were pulled in `omz update`
Co-authored-by: Marc Cornellà <hello@mcornella.com>

Co-authored-by: Fernando Crespo <fxcrespo@iMac-44054.local>
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Zsh versions older than 5.3 don't have ZSH_ARGZERO, so use an alternative
method to get the zsh command.

Fixes #9558

Fixes #9495

See https://github.com/ohmyzsh/ohmyzsh/issues/9087#issuecomment-712460275

- Add plugin and theme subcommand

  Fixes #8961

- Add confirmation prompt to `omz pr clean` command

- Correct behavior on invalid answers on confirmation prompts

  If an invalid option is supplied, don't proceed with the potentially
  destructive action.
Co-authored-by: Rishabh Bohra <rishabhbohra01@gmail.com>

Co-authored-by: Marc Cornellà <marc.cornella@live.com>