remove lambda from Context

#799 it teems like some runtimes do not like lambda attributes in pickle.dumps

manga_translator/utils/generic.py

@@ -26,13 +26,18 @@
 
 # Adapted from argparse.Namespace
 class Context(dict):
-    __getattr__ = dict.get
-    __setattr__ = dict.__setitem__
-    __delattr__ = dict.__delitem__
-
     def __init__(self, **kwargs):
         for name in kwargs:
             setattr(self, name, kwargs[name])
+
+    def __getattr__(self, item):
+        return self.get(item)
+
+    def __delattr__(self, key) -> None:
+        return self.__delitem__(key)
+
+    def __setattr__(self, key, value):
+        return self.__setitem__(key, value)
 
     def __eq__(self, other):
         if not isinstance(other, Context):