syntax: Reorganize links to highlight groups a little more

Two things:

* regular expressions use a syntax group for the / delimiters but they
  are not linked to a highlight group. regular expression are a little
  bit like strings in that their content is treated as some special kind
  of data.

* bracket/brace/parens should not be marked as delimiters. sure, they
  contain things but what they contain is not treated as special and
  doesn't represent actual data like strings and regexps -- if there's
  data in between those then other syntax groups should already be
  highlighting those parts. switching them to Operator adds more
  diversity in the symbols and makes the code more readable.

syntax/puppet.vim

@@ -489,9 +489,7 @@ syn region  puppetComment       start="/\*" end="\*/" contains=puppetTodo,puppet
 syn keyword puppetTodo          TODO NOTE FIXME XXX BUG HACK contained
 
 hi def link puppetStringDelimiter Delimiter
-hi def link puppetBracket         Delimiter
-hi def link puppetBrace           Delimiter
-hi def link puppetParen           Delimiter
+hi def link puppetRegexpDelimiter Delimiter
 hi def link puppetRegexp          puppetConstant
 hi def link puppetConstant        Constant
 hi def link puppetNoInterpolation puppetString
@@ -501,6 +499,9 @@ hi def link puppetFloat           Float
 hi def link puppetInteger         Number
 hi def link puppetBoolean         Boolean
 hi def link puppetType            Type
+hi def link puppetBracket         Operator
+hi def link puppetBrace           Operator
+hi def link puppetParen           Operator
 hi def link puppetOperator        Operator
 hi def link puppetStructure       Structure
 hi def link puppetName            puppetIdentifier