add vcs prefix keybinding map.
let Magit custom keybindings use my vcs prefix keybinding map.
add and init git-gutter and git-gutter-fringe packages and its settings.
add anzu package, and initial its settings.
add emacs-dired-k package and initial its settings.
rename init-my-prog-git.el to init-my-prog-vcs-git.el
rename package emacs-dired-k into dired-k.