Revert "Allow unquote on all values"

This reverts commit f4c5fbae274ddd545d34107e424fa3b9c842ea14.

This change resulted in nine regressions in the spec tests. This is a
change that we should make later when the `unquote()` function has the
correct functionality. For right now, the implementation of `unquote()` is a hack to just get
things working.

src/utils.rs

@@ -60,8 +60,9 @@ pub(crate) fn parse_interpolation<I: Iterator<Item = Token>>(
     Lexer::new(
         &Value::from_tokens(&mut val.into_iter().peekable(), scope)
             .unwrap()
-            .unquote()
             .to_string()
+            .replace("\"", "")
+            .replace("'", ""),
     )
     .collect::<Vec<Token>>()
 }

src/value/mod.rs

@@ -65,7 +65,7 @@ impl Value {
     pub fn unquote(self) -> Self {
         match self {
             Self::Ident(s1, _) => Self::Ident(s1, QuoteKind::None),
-            _ => self,
+            _ => todo!(),
         }
     }