Fixes #10448

Fixes #10422

Fixes #10404

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

In recent zsh versions, `${(@ps:$sep:)var}` where $sep is a variable containing
a separator string and $var is a string with multiple values separated by $sep,
the `p` flag makes zsh correctly expand $sep before splitting $var. In versions
older than 5.0.8, this doesn't happen, so we use `eval` to get the same effect.

Fixes #10345

This reverts commit 63b7e576.

Fixes #8387

Fixes #10187
Co-authored-by: NoPreserveRoot <NoPreserveRoot@pm.me>

Closes #8788
Co-authored-by: Nikolas Garofil <nikolas@garofil.be>

Co-authored-by: yyny <6576327+yyny@users.noreply.github.com>

This patch removes the 'exit 1' status code when the update check
finishes or is ended with CTRL+C.

Fixes #10033

Fixes #8427

Fixes #9701

* refactor(install.sh): fix static analysis warnings

Clear all warnings and errors raised by shellcheck.net static analysis.

- Replace non-POSIX shell use of `$OSTYPE` by POSIX compliant check on `uname -o`.
- Move variables out of`printf` format string.
- Refactor/simplify string formatters for error and underline.
- Fix expansion of arguments to a single string `$*` rather than individual elements `$@` within the error and underline formatters.

* fix(uname): non-posix -o option

* fix(install.sh): non portable which

Replaced non-portable `which zsh` by portable `command -v zsh`

Fixes #9629
Fixes #9700

* 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>