Vendor things

third-party/vendor/unicode-id/README.md

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+> [!IMPORTANT]
+> Try the optimized version [unicode-id-start](https://github.com/Boshen/unicode-id-start).
+
+# unicode-id
+
+Determine if a `char` is a valid identifier for a parser and/or lexer according to
+[Unicode Standard Annex #31](http://www.unicode.org/reports/tr31/) rules.
+
+This is a clone of [unicode-xid](https://github.com/unicode-rs/unicode-xid).
+
+```rust
+use unicode_id::UnicodeID;
+
+fn main() {
+    let ch = 'a';
+    println!("Is {} a valid start of an identifier? {}", ch, UnicodeID::is_id_start(ch));
+}
+```
+
+## features
+
+unicode-id supports a `no_std` feature. This eliminates dependence
+on std, and instead uses equivalent functions from core.
+
+## changelog
+
+### 0.3.4
+
+- Update to Unicode 15.1.0
+
+### 0.3.3
+
+- Update to Unicode 15.0.0
+
+### 0.3.2
+
+- Fix clippy warnings
+
+### 0.3.0
+
+- Fork repo for unicode-id
+- Update to Unicode 14.0.0
+
+### 0.2.2
+
+- Add an ASCII fast-path
+
+### 0.2.1
+
+- Update to Unicode 13.0.0
+- Speed up lookup
+
+### 0.2.0
+
+- Update to Unicode 12.1.0.
+
+### 0.1.0
+
+- Initial release.