Add syntax files from upstream vim repository

syntax/sbt.vim

@@ -1,3 +1,39 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Vim syntax file
+" Language:    sbt
+" Maintainer:  Steven Dobay <stevendobay at protonmail.com>
+" Last Change: 2017.04.30
+
+if exists("b:current_syntax")
+  finish
+endif
+
+runtime! syntax/scala.vim
+
+syn region sbtString start="\"[^"]" skip="\\\"" end="\"" contains=sbtStringEscape
+syn match sbtStringEscape "\\u[0-9a-fA-F]\{4}" contained
+syn match sbtStringEscape "\\[nrfvb\\\"]" contained
+
+syn match sbtIdentitifer "^\S\+\ze\s*\(:=\|++=\|+=\|<<=\|<+=\)"
+syn match sbtBeginningSeq "^[Ss]eq\>"
+
+syn match sbtSpecial "\(:=\|++=\|+=\|<<=\|<+=\)"
+
+syn match sbtLineComment "//.*"
+syn region sbtComment start="/\*" end="\*/"
+syn region sbtDocComment start="/\*\*" end="\*/" keepend
+
+hi link sbtString String
+hi link sbtIdentitifer Keyword
+hi link sbtBeginningSeq Keyword
+hi link sbtSpecial Special
+hi link sbtComment Comment
+hi link sbtLineComment Comment
+hi link sbtDocComment Comment
+
+
+endif
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'sbt') == -1
   
 " Vim syntax file