Add Python 3 modules, and more Python 2 modules.

Also, sort names alphabetically and add module docstrings.

python3/marshal.py

@@ -0,0 +1,13 @@
+"""Stub file for the 'marshal' module."""
+# This is an autogenerated file. It serves as a starting point
+# for a more percise manual annotation of this module.
+# Feel free to edit the source below, but remove this header when you do.
+
+def dump(a, b, *args, **kwargs) -> object: pass
+
+def dumps(a, *args, **kwargs) -> object: pass
+
+def load(*args, **kwargs) -> object:
+    raise TypeError()
+
+def loads(a) -> object: pass