Add features for each script type

src/format/fixed.rs

@@ -18,10 +18,16 @@ impl FixedFormatter {
         }
     }
 
+    #[cfg(feature = "circus")]
     fn is_circus(&self) -> bool {
         matches!(self.typ, Some(ScriptType::Circus))
     }
 
+    #[cfg(not(feature = "circus"))]
+    fn is_circus(&self) -> bool {
+        false
+    }
+
     pub fn format(&self, message: &str) -> String {
         let mut result = String::new();
         let vec: Vec<_> = UnicodeSegmentation::graphemes(message, true).collect();