Add "-" to iskeyword. This required a change to the syntax files too
because they were using the word begin and end atoms.
closes: #17259
Co-authored-by: Teemu Ikonen <tpikonen@mailbox.org>
Co-authored-by: A4-Tacks <wdsjxhno1001@163.com>
Signed-off-by: Aman Verma <amanraoverma@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>