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Merge rust-bitcoin/rust-bitcoin#2921: Make 'use core::fmt' calls consistent

<a class=hub.com/rust-bitcoin/rust-bitcoin/commit/<a class="double-link" href="https://git"><a class=hub.com/rust-bitcoin/rust-bitcoin/commit/8ee1744b9b0337c3fcf38f8da02735af6852c445">8ee1744b9 Make 'use core::fmt' calls consistent (Shing Him Ng)

Pull request description:

  I started taking a look at #2869 and looked for everything that was implementing the `Display` trait:

  ```rust
  impl fmt::Display for _
  ```

  but found some places where the imports weren't consistent:
  ```rust
  impl Display for _
  ```

  There were only a few instances of the latter, so I went ahead and cleaned those up before starting #2869

  I started pulling this thread when I saw the same thing was happening for `fmt::Debug` and `fmt::Formatter` so I updated the rest of the `use core::fmt::*` statements with a few exceptions:

  - No updates to `use core::fmt::*` if it was being called from within a function since I felt like the function scope was small enough to not cause confusion
  - No updates to `use core::fmt::{self, Write as _};`

ACKs for top commit:
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    ACK 8ee1744b9b0337c3fcf38f8da02735af6852c445
  tcharding:
    ACK 8ee1744b9b0337c3fcf38f8da02735af6852c445

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