* Touch.Client references the official NUnitLite package, which means we're using
a non-forked version of NUnit.
* This makes it easier for our .NET 5 effort, since we won't have to port an ancient
version of NUnitLite to .NET 5 (nor will we have to keep using it in our existing
code, we can use more modern NUnit patterns).
* Reference MonoTouch.Dialog from the NuGet package. This also eases the .NET 5 effort,
since we won't have to port MonoTouch.Dialog to .NET 5 (we'll probably still do it
though at some point, but it doesn't have to be done right away), nor build it
ourselves / ship it.
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