Always raise TypeError for wrong argument types

The code that checks whether hooks are callable() (and some other type
checks) should always raise TypeError on failure. Before this change,
both ValueError and TypeError were used in an inconsistent way (C
extension and Python implementation were not the same).

test/test_obj.py

@@ -31,7 +31,7 @@ def test_decode_pairs_hook():
     assert unpacked[1] == prod_sum
 
 def test_only_one_obj_hook():
-    with raises(ValueError):
+    with raises(TypeError):
         unpackb(b'', object_hook=lambda x: x, object_pairs_hook=lambda x: x)
 
 def test_bad_hook():