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Move WTF-8 code from std into core and alloc This is basically a small portion of rust-lang/rust#129411 with a smaller scope. It *does not*\* affect any public APIs; this code is still internal to the standard library. It just moves the WTF-8 code into `core` and `alloc` so it can be accessed by `no_std` crates like `backtrace`. > \* The only public API this affects is by adding a `Debug` implementation to `std::os::windows::ffi::EncodeWide`, which was not present before. This is due to the fact that `core` requires `Debug` implementations for all types, but `std` does not (yet) require this. Even though this was ultimately changed to be a wrapper over the original type, not a re-export, I decided to keep the `Debug` implementation so it remains useful. Like we do with ordinary strings, the tests are still located entirely in `alloc`, rather than splitting them into `core` and `alloc`. ---- Reviewer note: for ease of review, this is split into three commits: 1. Moving the original files into their new "locations" 2. Actually modifying the code to compile. 3. Removing aesthetic changes that were made so that the diff for commit 2 was readable. You can review commits 1 and 3 to verify these claims, but commit 2 contains the majority of the changes you should care about. ---- API changes: `impl Debug for std::os::windows::ffi::EncodeWide`