[Cuis-dev] Fixes for FFI

[Juan Vuletich]

Hi Stephen, Folks,

Yesterday I found some time to go over FFI. Tests were failing on all 
platforms. The reason was that String parameters are sent to the FFI 
plugin, and (most reasonably) it can't handle our instances of 
UnicodeString. Fix is to send UTF-8 bytes instead.

Fixes are now at GitHub. I can confirm that all tests pass on x64 
hardware runing MacOS, Windows and Linux.

Stephen, can you please try on the M1 Mac? You'd need to `Feature 
require: 'Tests-FFI` and then cmd-t on the system category. Or World / 
Open / SUnit Test Runner.

Thanks,

-- 
Juan Vuletich
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