updated README and a bunch of other stuff

core/src/item.rs

@@ -238,6 +238,9 @@ impl ItemData {
     pub fn value_string(self) -> MizeResult<String> {
         match self.cbor() {
             CborValue::Text(string) => Ok(string.to_owned()),
+            CborValue::Bool(val) => Ok(format!("{val}")),
+            CborValue::Integer(val) => Ok(format!("{}", u32::try_from(val.clone())?)),
+            CborValue::Float(val) => Ok(format!("{val}")),
             _ => Err(mize_err!("this ItemData has no string value")),
         }
     }