#Fix 30 Add shellcheck to CI and resolve shellcheck warnings and most…

… suggest… (#38)

* Add shellcheck to CI and resolve shellcheck warnings and most suggestions
* Lock down standards a bit more and tidy up
* move config into shellcheckrc

Merge pull request #36 from HeikoNeblung/main

Update offline versions file on successful list-remote calls

Disable colored output if -no-color flag used with terragrunt (#29)

* Disable colored output if -no-color flag used with terrgrunt

* Implement TGENV_DISABLE_COLOR env var and fix color usage

* Fix inconsistent use of indentation and square brackets

* Link to color reference

Creating a tgenv version updater to TGENV (#17)