Clean up the Filter module upgrade path

Continuing the quest to a cleaner upgrade path.

Quite a few issues with this one:

• It uses some API functions that it shouldn't. The most worrisome one is user_role_grant_permissions() which relies on user_permission_get_modules() in Drupal 7.
• filter_update_7003() creates the new filter table based on field_schema(), which it shouldn't do because field_schema() can change, but the update function shouldn't
• We rename the 'filters' table twice