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* 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`

Also prefix all formatting functions with fmt_

Related: #9427

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

Changing 'your' to 'you'

* Add option to install OMZ without replacing .zshrc

tools/install.sh respects REPLACE_RC environment variable
--noreplace-rc flag sets REPLACE_RC='no'

* Change REPLACE_RC=no to KEEP_ZSHRC=yes

Change --noreplace-rc to --keep-zshrc

* Change project URL from robbyrussell to ohmyzsh org

* Update git remote to use ohmyzsh org repository

- core.autocrlf=false -> #4069
- fsck.zeroPaddedFilemode -> #4963

Fixes #4069
Fixes #4963

tput is error-prone and may not be needed, since all the formatting
codes used are standard across all types of terminals.

tput may throw errors on invalid $TERM values, for example.
This shorthand syntax allows for that as well as for if tput
doesn't exist.

Co-authored-by: Antonio QUINTAVALLE <antonio.quintavalle@amadeus.com>
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Co-authored-by: Liquidsoul <liquidsoul@liquidsoul.fr>
Co-authored-by: Alexander Polynomdivision <digitalmail555@googlemail.com>
Co-authored-by: loket <loket@cruftlab.io>
Co-authored-by: Connor Demille <subtlepseudonym@gmail.com>

Co-authored-by: Joel Kuzmarski <leoj3n@gmail.com>

Co-authored-by: Marshall Ford <inbox@marshallford.me>
Co-authored-by: Joel Kuzmarski <leoj3n@gmail.com>

Supposed to be POSIX-compatible. Proved to work in dash, yash and whatever
alpine uses. See https://unix.stackexchange.com/a/371873

This facilitates testing of changes to the core installation code: you'll be
able to do a roundtrip test of install and uninstall using the working code on
your branch.

Controlled by passing $REPO and $BRANCH environment variables to install.sh.

This changes the behavior to default to the binary found first in $PATH,
then checking it's actually in the shells file (/etc/shells).

If that fails go back to the previous behavior, but actually check that
the path obtained exists in the filesystem.
Co-authored-by: Joel Kuzmarski <leoj3n@gmail.com>

Co-authored-by: Fredrik Fornwall <fredrik@fornwall.net>

Guard clauses are if constructs that return early if there is an error
that prevents continuing. This way there isn't a big nesting of if
expressions.

Otherwise we risk a situation where a full path to `zsh` is commented, i.e.:

    #/usr/local/bin/zsh

This replaces the currently running process with the new one using `exec`
instead of creating a new process. This way, when the user `exit`s out of
the new shell it will not pop them back into the shell from which ohmyzsh
was installed from.

This will allow us to use tab stripping heredocs with `<<-'.
See http://www.tldp.org/LDP/abs/html/here-docs.html#EX71A

Add editorconfig file to enforce this style.
See http://editorconfig.org for more information.

* Updating Oh My Zsh shop URLs

Linking directly to the Oh My Zsh inventory vs the top-level store with non-OMZ items.

* Updating link to Oh My Zsh products in the install script

* Updating link to Oh My Zsh shop products in the upgrade script

* Getting rid of 't-' in shirts for now

Fixes #7492