VIM: Makes vim open external files with opout

Vim can open external files when the cursor is "over" them by pushing gx

If in a netrw window, simply x is used.

This is useful when in, for example, a markdown file. I can view the
image by putting the cursor over the path and pushing gx

nvim/.config/nvim/plugin/settings.vim

@@ -34,3 +34,7 @@ set list listchars=tab:»\ ,trail:\␣,eol:↩
 
 " Stops vim wrapping in the middle of a word
 set linebreak
+
+" Sets tool for opening non-text files with gx
+" If in netrw, this is run with just x
+let g:netrw_browsex_viewer = "opout"