changes for v0.3.38beta3

  * update SDK conversion for VS2013 and Windws SDK 8.1
  * change some default colors when using dark theme in VS 2012+ (restart required)
  * Windows SDK 8.0/8.1 detection
  * fix bad "\n" in default x64 library search path
  * x64 executable and library search path not correctly saved for next VS start
  * improve project automation to mute NuGet (still empty project pretended)