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)
Committed: https://code.google.com/p/dart/source/detail?r=13495

[pquitslund, 2012-10-08 21:31:21]

A user-submitted patch for your enjoyment.  It looks reasonable to me but would
value your 2 cents.

[Anton Muhin, 2012-10-10 09:36:59]

LGTM too, Phil.