[clang-format-vs] Add Format on Save function. Add Format Document function.

[Péter Budai via cfe-commits]

Hi,

This patch adds Format on Save  and Format Document functions to clang-format-vs Visual Studio extension.

The automatic format option can be turned on and off completely or for specific file extensions via the Options dialog.
Patch is attached, tested on Visual Studio 2013 and 2015.

Peter Budai
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