Problem: filetype: stylus files not recognized
Solution: Detect '*.styl' and '*.stylus' as stylus filetype,
include indent, filetype and syntax plugin
(Philip H)
closes: #14656
Signed-off-by: Philip H <47042125+pheiduck@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
