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Merge rust-bitcoin/rust-bitcoin#4662: primitives: Inline `impl_to_hex_from_lower_hex` macro and deprecate

<a class=hub.com/rust-bitcoin/rust-bitcoin/commit/d42d478f1b6aab9969bb73108d8afdaf3db975e3">d42d478f1 primitives: Inline impl_to_hex_from_lower_hex and deprecate (Tobin C. Harding)

Pull request description:

  Macros are basically just a pain in the arse. This one is used to reduced code duplication/verbosity even thought the function can be written as a one-liner.
  
  Also calling macros across crate boundries is error prone and a constant source of maintenance grief.
  
  Note also:
  
  - The generated docs are quite general
  - `#[inline]` is missing
  - The docs on the macro are wrong in regards to the no-op
  
  Remove all calls to the macro from `primitives` and inline using terse syntax by way of the `format!` macro.
  
  Add `deprecated` attribute and direct users to just use `format!("{var:x}")` instead.


ACKs for top commit:
  apoelstra:
    ACK d42d478f1b6aab9969bb73108d8afdaf3db975e3; successfully ran local tests


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