Merge: Make the generated iOS project compilable in the XCode GUI

I originally incorporated the test project in the generated XCode workspace thinking that we could use it somehow. But it duplicates services from nitunits and it would be much more complex to use.

I remove the test project now because it is incomplete and raise errors from the XCode GUI.

Pull-Request: #1254
Reviewed-by: ArthurDelamare <arthur.delamare@viacesi.fr>
Reviewed-by: Jean Privat <jean@pryen.org>
Reviewed-by: Alexandre Terrasa <alexandre@moz-code.org>
Reviewed-by: Lucas Bajolet <r4pass@hotmail.com>