Vim: remove sqore_textwidth plugin
Git: set xdg-open as global web.browser
Tig: change top-level comment
Tig: tweak+remove comments and fix whitespace
Tig: change settings to work with latest version

A bunch of settings needed to either be removed or changed to work with
the latest version of tig.
Tig: remove line with no effect

This is already is the default.
Tig: prettier graphics
Tig: add binding for yanking current commit SHA