Provides `evil-better-visual-line-next-line' and
`evil-better-visual-line-previous-line', which act like
`evil-next-visual-line' and `evil-previous-visual-line'
unless in visual line or visual block mode, in which case
they act as `evil-next-line' and `evil-previous-line'.

Also provides `evil-better-visual-line-on', which binds j and k quickly
and conveniently