Resolve raw type warnings (#1516)

Also very small optimization to hopper counters and removal of redundant casts in `PerimeterDiagnostics`

src/main/java/carpet/script/value/NBTSerializableValue.java

@@ -373,7 +373,7 @@ public class NBTSerializableValue extends Value implements ContainerValueInterfa
         if (t instanceof CollectionTag)
         {
             List<Value> elems = new ArrayList<>();
-            CollectionTag<? extends Tag> ltag = (CollectionTag<? extends Tag>)t;
+            CollectionTag<?> ltag = (CollectionTag<?>)t;
             for (Tag elem: ltag)
             {
                 elems.add(decodeTagDeep(elem));