Fix implementation of to_utf8 and to_utf16 #123
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The current implementation of these functions do not properly convert between the unicode encodings and have caused bugs in the past. This new implementation makes use of std::codecvt and std::wstring_convert.
Although these specializations of codecvt are now deprecated in c++20, they will still work until there is a suitable replacement in the standard library, and as far as I know, such a thing does not exist yet.
It is recommended to use a proper library for this task. il2cpp has built in methods of performing this conversion, so it may be worth looking into that in the future.