Remove the Core Foundation dependency in Morphuntion

[grhoten]

It would be helpful to reduce the size of the dependencies and to be able to compile the API with the gcc compiler. This dependency has a Clang compiler dependency because the gcc compiler doesn't define the endianness that the Core Foundation headers will accept. This dependency is only needed for the C API. Perhaps we can consider mapping these types to something that ICU4C is more closely aligned with.

When mapping the data types, we should consider the following questions:

• How should informative error message in exceptions be conveyed? Use UErrorCode instead and lose the diagnostic information?
• How should a locale be specified? const char *?
• How should a string be specified? const char16_t * with length parameter? The code currently requires C11 as a minimum.
• How should an array or a map of objects be represented? This is a less trivial of a mapping, but it’s doable.

The only exception at this time is the UTF-16 data type. The current code depends on C11, which needs it to be char16_t instead of UChar, which is uint16_t in ICU4C.