Merge rust-bitcoin/rust-bitcoin#1138: Introduce new canonical license blurb

34f955a073 Introduce new canonical license blurb (Tobin C. Harding)

Pull request description:

  Recently we introduced SPDX license ids but there was some confusion
  about the use, form, and purpose of lines before (library name, author).

  It was pointed out to me by Andrew that if/when folks cut'n'paste our
  code they often will keep the whole blurb. Design it with that in
  mind. FTR, Andrew also indicated that he did not mind his name being
  removed in favour of "The rust-bitcoin developers".

  At first I thought the term "The rust-bitcoin developers" was a bit
  wishy-washy but yesterday I realised that I am proud to be part of that
  crew, striving to deliver code to the highest possible standard.

  Introduce a canonical format for the licences blurb.

  - Use the name of the library
  - Use "The rust-bitcoin developers"
  - Use the SPDX ID

ACKs for top commit:
  apoelstra:
    ACK 34f955a073
  Kixunil:
    ACK 34f955a073

Tree-SHA512: d488bebe9f7a862aa353b1f15c29c47579715d7a9a35120d4b4a5846f0100f4be3e53e2a412f0edea426c276f39740bbf07771ee51e0532951403168ba2b1224

src/blockdata/locktime.rs

@@ -1,15 +1,5 @@
-// Rust Bitcoin Library
-// Written in 2022 by
-//     Tobin C. Harding <me@tobin.cc>
-// To the extent possible under law, the author(s) have dedicated all
-// copyright and related and neighboring rights to this software to
-// the public domain worldwide. This software is distributed without
-// any warranty.
-//
-// You should have received a copy of the CC0 Public Domain Dedication
-// along with this software.
-// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
-//
+// Rust Bitcoin Library - Written by the rust-bitcoin developers.
+// SPDX-License-Identifier: CC0-1.0
 
 //! Provides type [`LockTime`] that implements the logic around nLockTime/OP_CHECKLOCKTIMEVERIFY.
 //!