configs/vim: Sync default cut buffer with clipboard/primary selection
configs/vim: Sync default cut buffer with clipboard/primary selection

Working a lot with tmux and multiple copies of vim, so this might make it
faster to copy text between them... I may not keep this, depending on how much
the constant clipboard clobbering does or does not annoy me.

DarkStarSword/junk,DarkStarSword/junk,DarkStarSword/junk,DarkStarSword/junk,DarkStarSword/junk