2.24.1:

* Added new Schema and SchemaValidator classes to MSVC project files
  (Arjan Franzen, Arming Burgmeier) Bug #563664.
* Avoid a memory leak in Validator::check_for_exception.
  (Arjan Franzen, Murray Cumming) Bug #563321.
* Avoid a memory leak in schema class.
  (Balazs Tirpak, Murray Cumming) Bug #312216.