Add docs/tests for enum change

Author: virtuald

CppHeaderParser/CppHeaderParser.py

@@ -1369,6 +1369,7 @@ class CppEnum(_CppEnum):
 
     * ``name`` - Name of the enum (ex. "ItemState")
     * ``namespace`` - Namespace containing the enum
+    * ``isclass`` - True if created via 'enum class' or 'enum struct'
     * ``values`` - List of values. The values are a dictionary with
       the following key/values:
 

test/test_CppHeaderParser.py

@@ -3575,6 +3575,7 @@ def test_enum(self):
             e["values"],
             [{"name": "V", "value": 1}],
         )
+        self.assertTrue(e["isclass"])
 
 
 class NestedResolving_TestCase(unittest.TestCase):