FB import and minor AIR improvements

Decided to drop the old branch and create a new one. And updated PlatformData to get default project templates.
The proper way for getting the home path was added in .NET 4.0, The only alternative to interop in older versions is using %userprofile% or %homedrive%%homepath%, although they have their own downsides. If you want to get rid of it that bad, I'll change it.

Unless Adobe members are lying about the use of that path to determine the EXTERNAL_THEME_DIR value.... because using other special folders as a reference is not going to work, as all of them can be customized.