Removing old ffi

[tesonep]

• Removing old FFI implementation (SqueakFFI)
• Removing Alien

[Ducasse]

Pablo some tests are related

unix-64 / Tests-unix-64 / testAllAtomicTypesCall – Unix64.UnifiedFFI.Tests.Tests.FFICalloutMethodBuilderTest
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unix-64 / Tests-unix-64 / testCallCreateObject – Unix64.UnifiedFFI.Tests.Tests.FFICalloutMethodBuilderTest
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unix-64 / Tests-unix-64 / testCallReturningEnumeration – Unix64.UnifiedFFI.Tests.Tests.FFICalloutMethodBuilderTest
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unix-64 / Tests-unix-64 / testCallSimple – Unix64.UnifiedFFI.Tests.Tests.FFICalloutMethodBuilderTest
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unix-64 / Tests-unix-64 / testCallWithConstant – Unix64.UnifiedFFI.Tests.Tests.FFICalloutMethodBuilderTest
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unix-64 / Tests-unix-64 / testCallWithObject – Unix64.UnifiedFFI.Tests.Tests.FFICalloutMethodBuilderTest
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unix-64 / Tests-unix-64 / testCallWithPointer – Unix64.UnifiedFFI.Tests.Tests.FFICalloutMethodBuilderTest
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unix-64 / Tests-unix-64 / testCallWithPointerPointer – Unix64.UnifiedFFI.Tests.Tests.FFICalloutMethodBuilderTest
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unix-64 / Tests-unix-64 / testCallWithSelf – Unix64.UnifiedFFI.Tests.Tests.FFICalloutMethodBuilderTest
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unix-64 / Tests-unix-64 / testParseFunction2 – Unix64.UnifiedFFI.Tests.Tests.FFIFunctionParserTest

[MarcusDenker]

tests look good now!