(hi-lock-regexp-history): Make it an obsolete alias

(hi-lock-regexp-history): Make it an obsolete alias
to `regexp-history'.
(hi-lock-face-history): Rename to `hi-lock-face-defaults' and
make it an obsolete alias to it.
(hi-lock-face-defaults): New variable renamed from
`hi-lock-face-history'.
(hi-lock-line-face-buffer, hi-lock-face-buffer)
(hi-lock-face-phrase-buffer): Use `read-regexp' instead of
`read-from-minibuffer'.  Doc fix.
(hi-lock-read-face-name): Replace `hi-lock-face-history' with
`hi-lock-face-defaults'.  Remove `mapcar (lambda (f) (cons f f))'.
Set `hist' arg of `completing-read' to `face-name-history'.
Put a list of default faces to `default' arg instead of `hist' arg.