This migrates all remaining uses of `cImport` (and `addTranslateC` for
good measure) to using translate-c for C translation, ensuring that we
are ready for when `cImport` is removed from the language, and also that
all sources of C translation are using the same snapshot of the external
package (when can then be updated when we need to fix something).
A couple of notes:
* A few options have been added to support the new translations, namely
the ability to link libraries (passed through to `linkLibrary` on the
Translator side) and whether or not to initialize default values (looks
like `cImport` did this without a way to control it, but translate-c
does not do it by default).
* Using the new library linking option actually simplifies the process
of translating a number of the C packages as we have been shipping the
necessary headers for these packages already with the applicable
libraries. For some of the more complex translation processes though, we
still include the appropriate directories directly.
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