BIP merges @bipmerges@x0f.org

[bips] Merged PR from 54627384: Update bip-0300.mediawiki with consistent use of "ACK-counter" term https://github.com/bitcoin/bips/pull/1333

[bips] Merged PR from hujiulong: Add BIP39 implementation reference https://github.com/bitcoin/bips/pull/1340

[bips] Merged PR from evanlinjin: bip-141: improve `witness` field wording https://github.com/bitcoin/bips/pull/1346

[bips] Merged PR from ShenghaiWang: Add one Swift implementation https://github.com/bitcoin/bips/pull/1331

[bips] Merged PR from SunitRoy2703: bip-39 dart implementation added https://github.com/bitcoin/bips/pull/1318

[bips] Merged PR from achow101: psbt: Unify formatting of key-value data to specify data type and name https://github.com/bitcoin/bips/pull/1345

[bips] Merged PR from achow101: 370: Add test vectors https://github.com/bitcoin/bips/pull/1342

[bips] Merged PR from JeremyRubin: [BIP-119] Use mediawiki syntax highlighting, add comment to spec https://github.com/bitcoin/bips/pull/1319

[bips] Merged PR from alexbosworth: typo: correct mispelling https://github.com/bitcoin/bips/pull/1326

[bips] Merged PR from jonasnick: bip-0340: clarify that lift_x fails with out-of-range inputs https://github.com/bitcoin/bips/pull/1334

[bips] Merged PR from achow101: 370: Clarifications of locktimes and tx modification flags https://github.com/bitcoin/bips/pull/1328

[bips] Merged PR from JeremyRubin: [BIP-119] Slim down motivation, add more references https://github.com/bitcoin/bips/pull/1320

[bips] Merged PR from alexbosworth: BIP 0371: Make hex example consistent with base64 https://github.com/bitcoin/bips/pull/1325

[bips] Merged PR from MarcoFalke: 179: Remove my email due to spam https://github.com/bitcoin/bips/pull/1337

[bips] Merged PR from wip-abramson: Fix incorrect signature test vectors in BIP322 https://github.com/bitcoin/bips/pull/1323

[bips] Merged PR from luke-jr: Bugfix: BIP 326: Correct Author/Title headings https://github.com/bitcoin/bips/pull/1314

[bips] Merged PR from katesalazar: [0112] fix broken link https://github.com/bitcoin/bips/pull/1276

[bips] Merged PR from dplusplus1024: Grammar update https://github.com/bitcoin/bips/pull/1300

[bips] Merged PR from katesalazar: BIP 0174: Remove transparent background from figures https://github.com/bitcoin/bips/pull/1193

[bips] Merged PR from allenpiscitello: Fixing incorrect allowing of unsigned transaction https://github.com/bitcoin/bips/pull/1290