Add support for git flow using the git-flow-next tool#5288

hmaddocks wants to merge 4 commits into

jesseduffield:masterjesseduffield/lazygit:masterfrom

hmaddocks:enable-git-flow-next-as-the-git-flow-toolhmaddocks/lazygit:enable-git-flow-next-as-the-git-flow-toolCopy head branch name to clipboard