hl-line-face should be a face, not an option

[Drew Adams]

It would be better to define a face `hl-line' than to have option
`hl-line-face', whose value must be an existing face. It's easier for
users to tweak a face definition than it is for them to find an
appropriate face ready-made, especially for something like this, which
is fairly intrusive. To get something else, they are obliged to define
a face themselves, which requires knowledge of Lisp.


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