Update Visual Studio projects and packaging.
Use explicitly Unicode Win32 APIs.
Modify VS props config for easy variation of output locations and messages.
Update NuGet packaging.
Update VS2010/2012 import props to match 2013.
Merge remote-tracking branch 'evoskuil/master'

* evoskuil/master:
  Update VS2010/2012 import props to match 2013.
  Update NuGet packaging.
  Modify VS props config for easy variation of output locations and messages.
  Use explicitly Unicode Win32 APIs.
  Update Visual Studio projects and packaging.