This plugin adds many useful aliases and functions.
See the wiki for a list of aliases and functions provided by the plugin.
Fixes #4085: core -> plugin dependency issue. Rename it to git_current_branch for clarity that it's git-specific. Update all plugins that were calling it to use new name. Fix variable leaks by making more variables in lib/git.zsh local. Have lib/git.zsh use [[ ]] instead of [ ] everywhere.