Improve backslash handling in :set option values. There is no special
handling for options supporting Windows path separators yet.
See :help option-backslash.
Remove the vimSetString syntax group. Option string values cannot be
specified with a quoted string, this is a command terminating tail
comment.
fixes: #16913closes: #17034
Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
