Enum description is optionally available for both file storage and GUI.

eg. [Description("v4.0|.NET Framework 4")]
BREAKING CHANGE: Using Project SubType (aka Flavor) instead of standalone Project.

MPF removed, new WinForm based property pages, VS.NuBuildNode is
completely changed, MS's CSVSXProjectSubType sample extended with
ComboBox handling and NuBuildPropertyPagePropertyStore uses the project
file properties instead of a separated XML block.