[Testers Required] New FreeType implementation using FFI

I have implemented the backend of FreeType using only FFI calls.

So the whole implementation is in the image side, the current plugin has a lot of problems handling the release of the pointers. The new implementation is using the mechanism that is already present in UFFI to release the Heap pointers, so it should be more stable and easier to modify if there is an issue.
The FT2Plugin is not used anymore in this version.
I have tested it in the different platforms, but beside OSX I have only made a smoke test. I need some users to try it, so I ask you if you can test in different installations.
The image can be downloaded from the CI
Thanks to all!!
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