libas of 7a1d87271ae812ad29a68e0f9ba46cca7b352049

Start with c# fork of libphonenumber-csharp from google.  Basically the
same as that commit with the code signing removed.  Removed the past
history as this plugin will pull in changes from my fork or the main for
as needed.
phone lib&test-builds same 4 failed tests as main
ref libphonenumber-csharp in PhoneNumbers corePCL