This also handle the case of setter-only properties (generated as a
set* method).
Unit tests added for existing methods (previously not generated)
Replace PR https://github.com/mono/Embeddinator-4000/pull/63
* EM0000 is now shown for unhandled exceptions - asking for a bug report
to be submitted;
* EM0001 is reported when the output directory cannot be found;
* EM1000 is reported when the generator throws a NotImplementedException,
no bug report is required, but contributions are welcome :)