git: Output in columns

Supported git commands should print their output in columns (e.g.
git-branch).

I am still unsure if I'd like to keep the option to fill rows first. The
default behaviour is columns first and `ls` does this too for example.
But I think that it makes more sense to fill the rows first, especially
with sorting by committerdate to delay the need to scroll as far as
possible.

.config/git/config

@@ -44,6 +44,8 @@
 [color "status"]
 	added = 076
 	untracked = 014
+[column]
+	ui = auto,row,dense
 [commit]
 	gpgsign = true
 	verbose = true