Finish adding type-annotations thoughout the code.

volatility/framework/interfaces/objects.py

@@ -19,7 +19,7 @@ class ReadOnlyMapping(validity.ValidityRoutines, collections.abc.Mapping):
     This ensures that the data stored in the mapping should not be modified, making an immutable mapping.
     """
 
-    def __init__(self, dictionary: typing.ChainMap[str, typing.Any]) -> None:
+    def __init__(self, dictionary: typing.Mapping[str, typing.Any]) -> None:
         self._dict = dictionary
 
     def __getattr__(self, attr: str) -> typing.Any:

volatility/framework/interfaces/symbols.py

@@ -174,14 +174,14 @@ class BaseSymbolTableInterface(validity.ValidityRoutines):
 
     # ## Functions for overriding classes
 
-    def set_type_class(self, name: str, clazz: objects.ObjectInterface) -> None:
+    def set_type_class(self, name: str, clazz: typing.Type[objects.ObjectInterface]) -> None:
         """Overrides the object class for a specific Symbol type
 
            Name *must* be present in self.types
         """
         raise NotImplementedError("Abstract method set_type_class not implemented yet.")
 
-    def get_type_class(self, name: str) -> objects.ObjectInterface:
+    def get_type_class(self, name: str) -> typing.Type[objects.ObjectInterface]:
         """Returns the class associated with a Symbol type"""
         raise NotImplementedError("Abstract method get_type_class not implemented yet.")