[PATCH] Handle zero-width and double-width characters in string literals and comments.

[Alexander Kornienko]

  Introduced FormatStyle::TabWidth setting (+tests), addressed Manuel's comments.

Hi djasper,

http://llvm-reviews.chandlerc.com/D1601

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1601?vs=4041&id=4061#toc

Files:
  include/clang/Format/Format.h
  lib/Format/BreakableToken.cpp
  lib/Format/BreakableToken.h
  lib/Format/ContinuationIndenter.cpp
  lib/Format/Encoding.h
  lib/Format/Format.cpp
  lib/Format/FormatToken.h
  lib/Format/WhitespaceManager.cpp
  unittests/Format/FormatTest.cpp
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