Log Message:
libmwaw: Update to 0.3.21

Changelog:
11/27/2021:
- add debug code to read some private rsrc data
  + allow to read some MacWrite which does not have printer informations

08/15/2021:
- add a parser for Scoop files

08/06/2021:
- add a parser for ScriptWriter files

07/29/2021:
- add a parser for ReadySetGo 1-4 files