allow getting meta name values in macros

src/kiss/Kiss.hx

@@ -123,6 +123,7 @@ class Kiss {
                 "symbolName" => Symbol("Prelude.symbolName"),
                 "symbolNameValue" => Symbol("Prelude.symbolNameValue"),
                 "typeNameValue" => Symbol("Prelude.typeNameValue"),
+                "metaNameValue" => Symbol("Prelude.metaNameValue"),
                 "typeName" => Symbol("Prelude.typeNameValue"),
                 "symbol" => Symbol("Prelude.symbol"),
                 "expList" => Symbol("Prelude.expList"),

src/kiss/Prelude.hx

@@ -561,6 +561,13 @@ class Prelude {
                 throw expected(s, allowed);
         };
     }
+    
+    public static function metaNameValue(s:ReaderExp):String {
+        return switch (s.def) {
+            case MetaExp(meta, _): meta;
+            default: "";
+        };
+    }
 
     public static function uuid() {
         return Uuid.v4().toShort();