Restore camelcase behaviour (ALL_CAPS -> AllCaps)

pb-jelly-gen/src/codegen.rs

@@ -249,7 +249,7 @@ fn camelcase(underscored: &str) -> String {
             let mut chars = s.chars();
             match chars.next() {
                 None => String::new(),
-                Some(first_char) => first_char.to_uppercase().collect::<String>() + chars.as_str(),
+                Some(first_char) => format!("{}{}", first_char.to_uppercase(), chars.as_str().to_lowercase()),
             }
         })
         .collect()