Merge bitcoindevkit/bdk#584: Release 0.18.0

Merge bitcoindevkit/bdk#584: Release 0.18.0

b5c8ce924bc47d26a0d577bfcbdaf241c56aa253 Bump version to 0.19.0-dev (Steve Myers)
e3ce50059fca2d58587fdf4dd806ffacfef3d302 Bump version to 0.18.0 (Steve Myers)
8a2a6bbceeec3f682c789537ca619da821d34732 Add `n:` wrapper to vulnerable scripts (Alekos Filini)
122e6e71405f65ecb3c75adaff1e35ab5ef3a06e Bump 'miniscript' dependency version to '^6.1' (Steve Myers)
9ed36875f1112d884f6c3c2beab89faf8aa5d2e0 export: Rename `WalletExport` to `FullyNodedExport` (Alekos Filini)
f90e3f978e3c7ec5dde0a592d79da419a7c9ec3a Update changelog with addition of keychain to AddressInfo (Steve Myers)
68e1b32d81978746dba0abdd14af94edbfdcf9b4 Bump version to 0.18.0-rc.1 (Steve Myers)

Pull request description:

  ### Description

  Release 0.18.0.

  ### Notes to the reviewers

  This branch also includes the following changes which are not yet in the `master` branch:

  - Rename `WalletExport` to `FullyNodedExport`, deprecate the former.
  - Bump `miniscript` dependency version to `^6.1`.

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

  #### New Features:

  * [ ] I've added tests for the new feature
  * [ ] I've added docs for the new feature
  * [x] I've updated `CHANGELOG.md`

ACKs for top commit:
  afilini:
    ACK b5c8ce924bc47d26a0d577bfcbdaf241c56aa253

Tree-SHA512: d6a8c1ca2c13d3a84704592053cc450557c96229b0092e655ccf97775c3e0a23e9e1499cf8c9fc5a24fc0665ec0333d0ec6d6b06cb15eb2e14c033f06c3032c2