[PATCH] Change design for handling escaped newline and trailing comment layout.

[Manuel Klimek]

Hi djasper,

Still needs some work, sending out for feedback of the design before I polish it
up.

The main change is in how we handle changes in the WhitespaceManager.
Instead of storing some changes, and applying others directly, we now
consistently store the changes in a uniform format, and do all layouting
in original source order in the end.
This allows us to correctly format unwrapped lines that are split up
by blocks, like:
f({
  g();
})

To support this, handling of protruding tokens had to be switched to an
a-priori annotation, which simplified the code (removing the need for
recursion).

This change also prepares more cleanup; I'm planning to have all alignments
done in the WhitespaceManager, which will also fix the problem of inconsistent
whitespace for indentation between comment alignments and other indents when
using tabs.

http://llvm-reviews.chandlerc.com/D840

Files:
  include/clang/Format/Format.h
  lib/Format/BreakableToken.cpp
  lib/Format/BreakableToken.h
  lib/Format/Format.cpp
  lib/Format/TokenAnnotator.cpp
  lib/Format/TokenAnnotator.h
  lib/Format/UnwrappedLineParser.cpp
  lib/Format/WhitespaceManager.cpp
  lib/Format/WhitespaceManager.h
  unittests/Format/FormatTest.cpp
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