v2.1.0 - gitlab-ci with pak and manage groups

Breaking changes

• use_gitlab_ci() does not use repo_name anymore as "rocker" images fix CRAN to a specific date.
• Functions deprecated since version 0.7 are removed
• Transfer ownership of the project to ThinkR-open

New features

• use_gitlab_ci() allows to decide whether to update R packages during the CI pipeline
• Add vignette to explain how to use 'gitlabr' with GitLab CI
• gl_new_group(), gl_edit_group(), gl_delete_group(), gl_list_groups(), gl_list_sub_groups() to deal with groups on a GitLab instance (@mpolano)
• gl_new_subgroup() to create a subgroup in a group (@margotbrd)
• gl_delete_file() to delete a file in a repository
• gl_list_project_members() and gl_list_group_members to retrieve members of a project or a group (#61, @datawookie)
• gitlab() queries allow for a vector of parameters to be passed to the API. This is needed when the API asks for an array (@klmr)

Minor changes

• multilist_to_tibble() transforms a deep structured nested list from an API into a tibble (#86, @statnmap, @ymansiaux)

Bug fixes

• gl_file_exists(), gl_list_files(), gl_push_file(), gl_delete_file() now work with files in subdirectories
• Fix handling file path in sub-directories in gl_push_file() (#73, #111)
• Fix combination of page and max_page for infinite pagination (#90)
• Fix auto_format=FALSE (#82)