chore: update to clap v4 & termion v2

src/textbuf/alphabet.rs

@@ -54,7 +54,7 @@ pub fn parse_alphabet(src: &str) -> Result<Alphabet> {
 }
 
 /// Type-safe string alphabet (newtype).
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct Alphabet(pub String);
 
 impl Alphabet {

src/textbuf/regexes.rs

@@ -47,7 +47,7 @@ pub(super) const PATTERNS: [(&str, &str); 20] = [
 ];
 
 /// Type-safe string Pattern Name (newtype).
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct NamedPattern(pub String, pub String);
 
 /// Parse a name string into `NamedPattern`, used during CLI parsing.