null-terminated-str 0.1.2

FFI-friendly utf-8 string, enabling const null-terminated str and caching of the non-terminated string to avoid frequent allocation.
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# null-terminated-str

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Provides null terminated utf-8 str `NullTerminatedStr` (borrowed) and
`NullTerminatedString` (owned) that is compatible with
 - `std::ffi::CStr`
 - `std::ffi::CString`
 - `str`
 - `String`

Also provides `const_null_terminated_str!` to create `NullTerminatedStr`
at compile time and `IntoNullTerminatedString` that accepts `&str`,
`String`, `&NullTerminatedStr` and `NullTerminatedString` to avoid
frequent allocation in FFI call.