new utf8proc_map_custom for hooking in user-defined custom mappings #89
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This PR supplies two new functions,
utf8proc_map_customandutf8proc_decompose_custom, which are like the oldutf8proc_mapandutf8proc_decomposeexcept that they allow the user to pass a custom mapping function that is applied to every codepoint in the input before any other transformation is performed.This will allow us to fix #11 without adding any Julia-specific code into utf8proc, and seems like a generally useful mechanism to have.
cc @jiahao, @StefanKarpinski