Disable monkeypatches, add dependencies via new hook (#60)

* code cleanups, disable monkeypatches, move to add_additional_deps

* disable incremental mode for tests

* add pip-wheel-metadata

* move some code from get_base_hook to get_attribute_hook to reduce dependencies

* simplify values/values_list tests and code

* disable cache for some tests failing with incremental mode

* enable incremental mode for tests typechecking

* pin mypy version

* fix tests

* lint

* fix internal crashes

scripts/mypy.ini

@@ -5,7 +5,7 @@ check_untyped_defs = True
 warn_no_return = False
 show_traceback = True
 allow_redefinition = True
-incremental = False
+incremental = True
 
 plugins =
     mypy_django_plugin.main