Vim syntax highlighting patches (dartbug.com/5568).
Vim syntax highlighting patches (dartbug.com/5568).

(Submitted by srackham.)

Adds multiline string hightlighting; adds new
syntaxes and deprecates old ones.

- Added: dartMultilineString, dartRawMultilineString

- Updated: new library and raw string syntaxes.

- Changed: string highlighting follows Dart Editor and normative
  conventions i.e.  hightlight entire string literal (don't exclude
    quotes).

- Deprecated (highlighted Todo and named like *_DEPRECATED):
  * old library and raw string syntaxes
  * Dynamic interface (added dynamic type keyword)
  * BadNumberFormatException (added FormatException)
Review URL: https://codereview.chromium.org//11085011

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@13495 260f80e4-7a28-3924-810f-c04153c831b5

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