Fix the HomographFixer to not throw exceptions

* Modify test to catch bug with Citation Form and Allomorph
* Modify the FixFwData exe to use a green screen crash box
* Modify build to download Palaso artifacts instead of having them
  committed
* Update the icu.net.dll to match the AssemblyVersion info for the
  latest Palaso.dll

Change-Id: I514946960a2062dfe0146783633d485010c5f1d2